source: chapter08/util-linux.xml@ 5569a3e

multilib
Last change on this file since 5569a3e was 5569a3e, checked in by Thomas Trepl <thomas@…>, 5 months ago

Automatic merge of trunk into multilib

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1<?xml version="1.0" encoding="UTF-8"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-util-linux" role="wrap">
9 <?dbhtml filename="util-linux.html"?>
10
11 <sect1info condition="script">
12 <productname>util-linux</productname>
13 <productnumber>&util-linux-version;</productnumber>
14 <address>&util-linux-url;</address>
15 </sect1info>
16
17 <title>Util-linux-&util-linux-version;</title>
18
19 <indexterm zone="ch-system-util-linux">
20 <primary sortas="a-Util-linux">Util-linux</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Util-linux package contains miscellaneous utility programs.
27 Among them are utilities for handling file systems, consoles, partitions,
28 and messages.</para>
29
30 <segmentedlist>
31 <segtitle>&buildtime;</segtitle>
32 <segtitle>&diskspace;</segtitle>
33
34 <seglistitem>
35 <seg>&util-linux-fin-sbu;</seg>
36 <seg>&util-linux-fin-du;</seg>
37 </seglistitem>
38 </segmentedlist>
39
40 </sect2>
41
42 <sect2 role="installation">
43 <title>Installation of Util-linux</title>
44
45 <para>First, disable a problematic test:</para>
46
47 <screen><userinput remap="pre">sed -i '/test_mkfds/s/^/#/' tests/helpers/Makemodule.am</userinput></screen>
48
49 <para>Prepare Util-linux for compilation:</para>
50
51<screen revision="sysv"><userinput remap="configure">./configure --bindir=/usr/bin \
52 --libdir=/usr/lib \
53 --runstatedir=/run \
54 --sbindir=/usr/sbin \
55 --disable-chfn-chsh \
56 --disable-login \
57 --disable-nologin \
58 --disable-su \
59 --disable-setpriv \
60 --disable-runuser \
61 --disable-pylibmount \
62 --disable-static \
63 --without-python \
64 --without-systemd \
65 --without-systemdsystemunitdir \
66 ADJTIME_PATH=/var/lib/hwclock/adjtime \
67 --docdir=/usr/share/doc/util-linux-&util-linux-version;</userinput></screen>
68
69<screen revision="systemd"><userinput remap="configure">./configure --bindir=/usr/bin \
70 --libdir=/usr/lib \
71 --runstatedir=/run \
72 --sbindir=/usr/sbin \
73 --disable-chfn-chsh \
74 --disable-login \
75 --disable-nologin \
76 --disable-su \
77 --disable-setpriv \
78 --disable-runuser \
79 --disable-pylibmount \
80 --disable-static \
81 --without-python \
82 ADJTIME_PATH=/var/lib/hwclock/adjtime \
83 --docdir=/usr/share/doc/util-linux-&util-linux-version;</userinput></screen>
84
85 <para>The --disable and --without options prevent warnings about
86 building components that either require packages not in LFS, or are
87 inconsistent with programs installed by other packages.</para>
88
89 <para>Compile the package:</para>
90
91<screen><userinput remap="make">make</userinput></screen>
92
93 <para>If desired, run the test suite as a non-&root; user:</para>
94
95 <warning><para>Running the test suite as the
96 <systemitem class="username">root</systemitem> user can be harmful to
97 your system. To run it, the CONFIG_SCSI_DEBUG option for the kernel must
98 be available in the currently running system and must be built as a
99 module. Building it into the kernel will prevent booting. For complete
100 coverage, other BLFS packages must be installed. If desired, this test can
101 be run by booting into the completed LFS system and running:</para>
102
103<screen role="nodump"><userinput>bash tests/run.sh --srcdir=$PWD --builddir=$PWD</userinput></screen>
104 </warning>
105
106<screen><userinput remap="test">chown -R tester .
107su tester -c "make -k check"</userinput></screen>
108
109 <para>The <emphasis>hardlink</emphasis> tests will fail if the host's kernel
110 does not have the option <option>CONFIG_CRYPTO_USER_API_HASH</option>
111 enabled or does not have any options providing a SHA256 implementation
112 (for example, <option>CONFIG_CRYPTO_SHA256</option>, or
113 <option>CONFIG_CRYPTO_SHA256_SSSE3</option> if the CPU supports
114 Supplemental SSE3) enabled. In addition,
115 two sub-tests from misc: mbsencode and one sub-test from script: replay are
116 known to fail.</para>
117
118 <para>Install the package:</para>
119
120<screen><userinput remap="install">make install</userinput></screen>
121<!--
122 <para>Finally, install the man pages:</para>
123
124<screen><userinput remap="install">tar -xf ../util-linux-man-pages-&util-linux-version;.tar.xz - -directory /usr/share/man - -strip-components=1</userinput></screen>
125-->
126 </sect2>
127
128 <!-- - - - - - - - - - -->
129 <!-- Multilib - 32bit -->
130 <!-- - - - - - - - - - -->
131
132 <sect2 arch="ml_32,ml_all" role="installation">
133 <title>Installation of Util-linux - 32-bit</title>
134
135 <para>Clean previous build:</para>
136
137<screen><userinput remap="pre">make distclean</userinput></screen>
138
139 <para>Move a tool out of the way which is optionally used by
140 configure but will report invalid pathes for multilib builds.</para>
141
142<screen><userinput remap="configure">mv /usr/bin/ncursesw6-config{,.tmp}</userinput></screen>
143
144 <para>Prepare Util-linux for compilation:</para>
145
146<screen revision="sysv"><userinput remap="configure">CC="gcc -m32" \
147./configure ADJTIME_PATH=/var/lib/hwclock/adjtime \
148 --host=i686-pc-linux-gnu \
149 --libdir=/usr/lib32 \
150 --docdir=/usr/share/doc/util-linux-&util-linux-version; \
151 --disable-chfn-chsh \
152 --disable-login \
153 --disable-nologin \
154 --disable-su \
155 --disable-setpriv \
156 --disable-runuser \
157 --disable-pylibmount \
158 --disable-static \
159 --without-python \
160 --without-systemd \
161 --without-systemdsystemunitdir</userinput></screen>
162
163<screen revision="systemd"><userinput remap="configure">CC="gcc -m32" \
164./configure ADJTIME_PATH=/var/lib/hwclock/adjtime \
165 --host=i686-pc-linux-gnu \
166 --libdir=/usr/lib32 \
167 --docdir=/usr/share/doc/util-linux-&util-linux-version; \
168 --disable-chfn-chsh \
169 --disable-login \
170 --disable-nologin \
171 --disable-su \
172 --disable-setpriv \
173 --disable-runuser \
174 --disable-pylibmount \
175 --disable-static \
176 --without-python</userinput></screen>
177
178 <para>Restore the tool previously moved away:</para>
179
180<screen><userinput remap="configure">mv /usr/bin/ncursesw6-config{.tmp,}</userinput></screen>
181
182 <para>Compile the package:</para>
183
184<screen><userinput remap="make">make</userinput></screen>
185
186 <para>Install the package:</para>
187
188<screen><userinput remap="install">make DESTDIR=$PWD/DESTDIR install
189cp -Rv DESTDIR/usr/lib32/* /usr/lib32
190rm -rf DESTDIR</userinput></screen>
191
192 </sect2><!-- m32 -->
193
194 <!-- - - - - - - - - - -->
195 <!-- Multilib - x32bit -->
196 <!-- - - - - - - - - - -->
197
198 <sect2 arch="ml_x32,ml_all" role="installation">
199 <title>Installation of Util-linux - x32-bit</title>
200
201 <para>Clean previous build:</para>
202
203<screen><userinput remap="pre">make distclean</userinput></screen>
204
205 <para>Move a tool out of the way which is optionally used by
206 configure but will report invalid pathes for multilib builds.</para>
207
208<screen><userinput remap="configure">mv /usr/bin/ncursesw6-config{,.tmp}</userinput></screen>
209
210 <para>Prepare Util-linux for compilation:</para>
211
212<screen revision="sysv"><userinput remap="configure">CC="gcc -mx32" \
213./configure ADJTIME_PATH=/var/lib/hwclock/adjtime \
214 --host=x86_64-pc-linux-gnux32 \
215 --libdir=/usr/libx32 \
216 --docdir=/usr/share/doc/util-linux-&util-linux-version; \
217 --disable-chfn-chsh \
218 --disable-login \
219 --disable-nologin \
220 --disable-su \
221 --disable-setpriv \
222 --disable-runuser \
223 --disable-pylibmount \
224 --disable-static \
225 --without-python \
226 --without-systemd \
227 --without-systemdsystemunitdir</userinput></screen>
228
229<screen revision="systemd"><userinput remap="configure">CC="gcc -mx32" \
230./configure ADJTIME_PATH=/var/lib/hwclock/adjtime \
231 --host=x86_64-pc-linux-gnux32 \
232 --libdir=/usr/libx32 \
233 --docdir=/usr/share/doc/util-linux-&util-linux-version; \
234 --disable-chfn-chsh \
235 --disable-login \
236 --disable-nologin \
237 --disable-su \
238 --disable-setpriv \
239 --disable-runuser \
240 --disable-pylibmount \
241 --disable-static \
242 --without-python</userinput></screen>
243
244 <para>Restore the tool previously moved away:</para>
245
246<screen><userinput remap="configure">mv /usr/bin/ncursesw6-config{.tmp,}</userinput></screen>
247
248 <para>Compile the package:</para>
249
250<screen><userinput remap="make">make</userinput></screen>
251
252 <para>Install the package:</para>
253
254<screen><userinput remap="install">make DESTDIR=$PWD/DESTDIR install
255cp -Rv DESTDIR/usr/libx32/* /usr/libx32
256rm -rf DESTDIR</userinput></screen>
257
258 </sect2><!-- mx32 -->
259
260 <sect2 id="contents-utillinux" role="content">
261 <title>Contents of Util-linux</title>
262
263 <segmentedlist>
264 <segtitle>Installed programs</segtitle>
265 <segtitle>Installed libraries</segtitle>
266 <segtitle>Installed directories</segtitle>
267
268 <seglistitem>
269 <seg>addpart, agetty, blkdiscard, blkid, blkzone, blockdev, cal, cfdisk, chcpu,
270 chmem, choom, chrt, col, colcrt, colrm, column, ctrlaltdel, delpart, dmesg,
271 eject, fallocate, fdisk, fincore, findfs, findmnt, flock, fsck,
272 fsck.cramfs, fsck.minix, fsfreeze, fstrim, getopt, hardlink, hexdump, hwclock,
273 i386 (link to setarch), ionice, ipcmk, ipcrm, ipcs, irqtop, isosize, kill, last,
274 lastb (link to last), ldattach, linux32 (link to setarch), linux64 (link to setarch),
275 logger, look, losetup, lsblk, lscpu, lsipc, lsirq, lsfd, lslocks, lslogins,
276 lsmem, lsns, mcookie, mesg, mkfs, mkfs.bfs, mkfs.cramfs, mkfs.minix, mkswap,
277 more, mount, mountpoint, namei, nsenter, partx, pivot_root, prlimit,
278 readprofile, rename, renice, resizepart, rev, rfkill, rtcwake, script,
279 scriptlive, scriptreplay, setarch, setsid, setterm, sfdisk, sulogin, swaplabel,
280 swapoff, swapon, switch_root, taskset, uclampset, ul,
281 umount, uname26 (link to setarch), unshare, utmpdump, uuidd, uuidgen, uuidparse,
282 wall, wdctl, whereis, wipefs, x86_64 (link to setarch), and zramctl</seg>
283 <seg>libblkid.so, libfdisk.so, libmount.so,
284 libsmartcols.so, and libuuid.so</seg>
285 <seg>/usr/include/blkid,
286 /usr/include/libfdisk,
287 /usr/include/libmount,
288 /usr/include/libsmartcols,
289 /usr/include/uuid,
290 /usr/share/doc/util-linux-&util-linux-version;,
291 and /var/lib/hwclock</seg>
292 </seglistitem>
293 </segmentedlist>
294
295 <variablelist>
296 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
297 <?dbfo list-presentation="list"?>
298 <?dbhtml list-presentation="table"?>
299
300 <varlistentry id="addpart">
301 <term><command>addpart</command></term>
302 <listitem>
303 <para>Informs the Linux kernel of new partitions</para>
304 <indexterm zone="ch-system-util-linux addpart">
305 <primary sortas="b-addpart">addpart</primary>
306 </indexterm>
307 </listitem>
308 </varlistentry>
309
310 <varlistentry id="agetty">
311 <term><command>agetty</command></term>
312 <listitem>
313 <para>Opens a tty port, prompts for a login name,
314 and then invokes the <command>login</command> program</para>
315 <indexterm zone="ch-system-util-linux agetty">
316 <primary sortas="b-agetty">agetty</primary>
317 </indexterm>
318 </listitem>
319 </varlistentry>
320
321 <varlistentry id="blkdiscard">
322 <term><command>blkdiscard</command></term>
323 <listitem>
324 <para>Discards sectors on a device</para>
325 <indexterm zone="ch-system-util-linux blkdiscard">
326 <primary sortas="b-blkdiscard">blkdiscard</primary>
327 </indexterm>
328 </listitem>
329 </varlistentry>
330
331 <varlistentry id="blkid">
332 <term><command>blkid</command></term>
333 <listitem>
334 <para>A command line utility to locate and print block device
335 attributes</para>
336 <indexterm zone="ch-system-util-linux blkid">
337 <primary sortas="b-blkid">blkid</primary>
338 </indexterm>
339 </listitem>
340 </varlistentry>
341
342 <varlistentry id="blkzone">
343 <term><command>blkzone</command></term>
344 <listitem>
345 <para>Is used to manage zoned storage block devices</para>
346 <indexterm zone="ch-system-util-linux blkzone">
347 <primary sortas="b-blkzone">blkzone</primary>
348 </indexterm>
349 </listitem>
350 </varlistentry>
351
352 <varlistentry id="blockdev">
353 <term><command>blockdev</command></term>
354 <listitem>
355 <para>Allows users to call block device ioctls from the command
356 line</para>
357 <indexterm zone="ch-system-util-linux blockdev">
358 <primary sortas="b-blockdev">blockdev</primary>
359 </indexterm>
360 </listitem>
361 </varlistentry>
362
363 <varlistentry id="cal">
364 <term><command>cal</command></term>
365 <listitem>
366 <para>Displays a simple calendar</para>
367 <indexterm zone="ch-system-util-linux cal">
368 <primary sortas="b-cal">cal</primary>
369 </indexterm>
370 </listitem>
371 </varlistentry>
372
373 <varlistentry id="cfdisk">
374 <term><command>cfdisk</command></term>
375 <listitem>
376 <para>Manipulates the partition table of the given device</para>
377 <indexterm zone="ch-system-util-linux cfdisk">
378 <primary sortas="b-cfdisk">cfdisk</primary>
379 </indexterm>
380 </listitem>
381 </varlistentry>
382
383 <varlistentry id="chcpu">
384 <term><command>chcpu</command></term>
385 <listitem>
386 <para>Modifies the state of CPUs</para>
387 <indexterm zone="ch-system-util-linux chcpu">
388 <primary sortas="b-chcpu">chcpu</primary>
389 </indexterm>
390 </listitem>
391 </varlistentry>
392
393 <varlistentry id="chmem">
394 <term><command>chmem</command></term>
395 <listitem>
396 <para>Configures memory</para>
397 <indexterm zone="ch-system-util-linux chmem">
398 <primary sortas="b-chmem">chmem</primary>
399 </indexterm>
400 </listitem>
401 </varlistentry>
402
403 <varlistentry id="choom">
404 <term><command>choom</command></term>
405 <listitem>
406 <para>Displays and adjusts OOM-killer scores, used to determine
407 which process to kill first when Linux is Out Of Memory</para>
408 <indexterm zone="ch-system-util-linux choom">
409 <primary sortas="b-choom">choom</primary>
410 </indexterm>
411 </listitem>
412 </varlistentry>
413
414 <varlistentry id="chrt">
415 <term><command>chrt</command></term>
416 <listitem>
417 <para>Manipulates real-time attributes of a process</para>
418 <indexterm zone="ch-system-util-linux chrt">
419 <primary sortas="b-chrt">chrt</primary>
420 </indexterm>
421 </listitem>
422 </varlistentry>
423
424 <varlistentry id="col">
425 <term><command>col</command></term>
426 <listitem>
427 <para>Filters out reverse line feeds</para>
428 <indexterm zone="ch-system-util-linux col">
429 <primary sortas="b-col">col</primary>
430 </indexterm>
431 </listitem>
432 </varlistentry>
433
434 <varlistentry id="colcrt">
435 <term><command>colcrt</command></term>
436 <listitem>
437 <para>Filters <command>nroff</command> output for terminals
438 that lack some capabilities, such as overstriking and half-lines</para>
439 <indexterm zone="ch-system-util-linux colcrt">
440 <primary sortas="b-colcrt">colcrt</primary>
441 </indexterm>
442 </listitem>
443 </varlistentry>
444
445 <varlistentry id="colrm">
446 <term><command>colrm</command></term>
447 <listitem>
448 <para>Filters out the given columns</para>
449 <indexterm zone="ch-system-util-linux colrm">
450 <primary sortas="b-colrm">colrm</primary>
451 </indexterm>
452 </listitem>
453 </varlistentry>
454
455 <varlistentry id="column">
456 <term><command>column</command></term>
457 <listitem>
458 <para>Formats a given file into multiple columns</para>
459 <indexterm zone="ch-system-util-linux column">
460 <primary sortas="b-column">column</primary>
461 </indexterm>
462 </listitem>
463 </varlistentry>
464
465 <varlistentry id="ctrlaltdel">
466 <term><command>ctrlaltdel</command></term>
467 <listitem>
468 <para>Sets the function of the Ctrl+Alt+Del key combination to a
469 hard or a soft reset</para>
470 <indexterm zone="ch-system-util-linux ctrlaltdel">
471 <primary sortas="b-ctrlaltdel">ctrlaltdel</primary>
472 </indexterm>
473 </listitem>
474 </varlistentry>
475
476 <varlistentry id="delpart">
477 <term><command>delpart</command></term>
478 <listitem>
479 <para>Asks the Linux kernel to remove a partition</para>
480 <indexterm zone="ch-system-util-linux delpart">
481 <primary sortas="b-delpart">delpart</primary>
482 </indexterm>
483 </listitem>
484 </varlistentry>
485
486 <varlistentry id="dmesg">
487 <term><command>dmesg</command></term>
488 <listitem>
489 <para>Dumps the kernel boot messages</para>
490 <indexterm zone="ch-system-util-linux dmesg">
491 <primary sortas="b-dmesg">dmesg</primary>
492 </indexterm>
493 </listitem>
494 </varlistentry>
495
496 <varlistentry id="eject">
497 <term><command>eject</command></term>
498 <listitem>
499 <para>Ejects removable media</para>
500 <indexterm zone="ch-system-util-linux eject">
501 <primary sortas="b-eject">eject</primary>
502 </indexterm>
503 </listitem>
504 </varlistentry>
505
506 <varlistentry id="fallocate">
507 <term><command>fallocate</command></term>
508 <listitem>
509 <para>Preallocates space to a file</para>
510 <indexterm zone="ch-system-util-linux fallocate">
511 <primary sortas="b-fallocate">fallocate</primary>
512 </indexterm>
513 </listitem>
514 </varlistentry>
515
516 <varlistentry id="fdisk">
517 <term><command>fdisk</command></term>
518 <listitem>
519 <para>Manipulates the partition table of the given device</para>
520 <indexterm zone="ch-system-util-linux fdisk">
521 <primary sortas="b-fdisk">fdisk</primary>
522 </indexterm>
523 </listitem>
524 </varlistentry>
525
526 <varlistentry id="fincore">
527 <term><command>fincore</command></term>
528 <listitem>
529 <para>Counts pages of file contents in core</para>
530 <indexterm zone="ch-system-util-linux fincore">
531 <primary sortas="b-fincore">fincore</primary>
532 </indexterm>
533 </listitem>
534 </varlistentry>
535
536 <varlistentry id="findfs">
537 <term><command>findfs</command></term>
538 <listitem>
539 <para>Finds a file system, either by label or Universally Unique Identifier
540 (UUID)</para>
541 <indexterm zone="ch-system-util-linux findfs">
542 <primary sortas="b-findfs">findfs</primary>
543 </indexterm>
544 </listitem>
545 </varlistentry>
546
547 <varlistentry id="findmnt">
548 <term><command>findmnt</command></term>
549 <listitem>
550 <para>Is a command line interface to the libmount library
551 for working with mountinfo, fstab and mtab files</para>
552 <indexterm zone="ch-system-util-linux findmnt">
553 <primary sortas="b-findmnt">findmnt</primary>
554 </indexterm>
555 </listitem>
556 </varlistentry>
557
558 <varlistentry id="flock">
559 <term><command>flock</command></term>
560 <listitem>
561 <para>Acquires a file lock and then executes a command with the lock
562 held</para>
563 <indexterm zone="ch-system-util-linux flock">
564 <primary sortas="b-flock">flock</primary>
565 </indexterm>
566 </listitem>
567 </varlistentry>
568
569 <varlistentry id="fsck">
570 <term><command>fsck</command></term>
571 <listitem>
572 <para>Is used to check, and optionally repair, file systems</para>
573 <indexterm zone="ch-system-util-linux fsck">
574 <primary sortas="b-fsck">fsck</primary>
575 </indexterm>
576 </listitem>
577 </varlistentry>
578
579 <varlistentry id="fsck.cramfs">
580 <term><command>fsck.cramfs</command></term>
581 <listitem>
582 <para>Performs a consistency check on the Cramfs file system on the
583 given device</para>
584 <indexterm zone="ch-system-util-linux fsck.cramfs">
585 <primary sortas="b-fsck.cramfs">fsck.cramfs</primary>
586 </indexterm>
587 </listitem>
588 </varlistentry>
589
590 <varlistentry id="fsck.minix">
591 <term><command>fsck.minix</command></term>
592 <listitem>
593 <para>Performs a consistency check on the Minix file system on the
594 given device</para>
595 <indexterm zone="ch-system-util-linux fsck.minix">
596 <primary sortas="b-fsck.minix">fsck.minix</primary>
597 </indexterm>
598 </listitem>
599 </varlistentry>
600
601 <varlistentry id="fsfreeze">
602 <term><command>fsfreeze</command></term>
603 <listitem>
604 <para>Is a very simple wrapper around FIFREEZE/FITHAW ioctl
605 kernel driver operations</para>
606 <indexterm zone="ch-system-util-linux fsfreeze">
607 <primary sortas="b-fsfreeze">fsfreeze</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611
612 <varlistentry id="fstrim">
613 <term><command>fstrim</command></term>
614 <listitem>
615 <para>Discards unused blocks on a mounted filesystem</para>
616 <indexterm zone="ch-system-util-linux fstrim">
617 <primary sortas="b-fstrim">fstrim</primary>
618 </indexterm>
619 </listitem>
620 </varlistentry>
621
622 <varlistentry id="getopt">
623 <term><command>getopt</command></term>
624 <listitem>
625 <para>Parses options in the given command line</para>
626 <indexterm zone="ch-system-util-linux getopt">
627 <primary sortas="b-getopt">getopt</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry>
631
632 <varlistentry id="hardlink">
633 <term><command>hardlink</command></term>
634 <listitem>
635 <para>Consolidates duplicate files by creating hard links</para>
636 <indexterm zone="ch-system-util-linux hardlink">
637 <primary sortas="b-hardlink">hardlink</primary>
638 </indexterm>
639 </listitem>
640 </varlistentry>
641
642 <varlistentry id="hexdump">
643 <term><command>hexdump</command></term>
644 <listitem>
645 <para>Dumps the given file in hexadecimal, decimal, octal,
646 or ascii</para>
647 <indexterm zone="ch-system-util-linux hexdump">
648 <primary sortas="b-hexdump">hexdump</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="hwclock">
654 <term><command>hwclock</command></term>
655 <listitem>
656 <para>Reads or sets the system's hardware clock, also called
657 the Real-Time Clock (RTC) or Basic Input-Output System (BIOS)
658 clock</para>
659 <indexterm zone="ch-system-util-linux hwclock">
660 <primary sortas="b-hwclock">hwclock</primary>
661 </indexterm>
662 </listitem>
663 </varlistentry>
664
665 <varlistentry id="i386">
666 <term><command>i386</command></term>
667 <listitem>
668 <para>A symbolic link to setarch</para>
669 <indexterm zone="ch-system-util-linux i386">
670 <primary sortas="b-i386">i386</primary>
671 </indexterm>
672 </listitem>
673 </varlistentry>
674
675 <varlistentry id="ionice">
676 <term><command>ionice</command></term>
677 <listitem>
678 <para>Gets or sets the io scheduling class and priority for a program</para>
679 <indexterm zone="ch-system-util-linux ionice">
680 <primary sortas="b-ionice">ionice</primary>
681 </indexterm>
682 </listitem>
683 </varlistentry>
684
685 <varlistentry id="ipcmk">
686 <term><command>ipcmk</command></term>
687 <listitem>
688 <para>Creates various IPC resources</para>
689 <indexterm zone="ch-system-util-linux ipcmk">
690 <primary sortas="b-ipcmk">ipcmk</primary>
691 </indexterm>
692 </listitem>
693 </varlistentry>
694
695 <varlistentry id="ipcrm">
696 <term><command>ipcrm</command></term>
697 <listitem>
698 <para>Removes the given Inter-Process Communication (IPC) resource</para>
699 <indexterm zone="ch-system-util-linux ipcrm">
700 <primary sortas="b-ipcrm">ipcrm</primary>
701 </indexterm>
702 </listitem>
703 </varlistentry>
704
705 <varlistentry id="ipcs">
706 <term><command>ipcs</command></term>
707 <listitem>
708 <para>Provides IPC status information</para>
709 <indexterm zone="ch-system-util-linux ipcs">
710 <primary sortas="b-ipcs">ipcs</primary>
711 </indexterm>
712 </listitem>
713 </varlistentry>
714
715 <varlistentry id="irqtop">
716 <term><command>irqtop</command></term>
717 <listitem>
718 <para>Displays kernel interrupt counter information in
719 <ulink role='man' url='&man;top.1'>top(1)</ulink> style
720 view</para>
721 <indexterm zone="ch-system-util-linux irqtop">
722 <primary sortas="b-irqtop">irqtop</primary>
723 </indexterm>
724 </listitem>
725 </varlistentry>
726
727 <varlistentry id="isosize">
728 <term><command>isosize</command></term>
729 <listitem>
730 <para>Reports the size of an iso9660 file system</para>
731 <indexterm zone="ch-system-util-linux isosize">
732 <primary sortas="b-isosize">isosize</primary>
733 </indexterm>
734 </listitem>
735 </varlistentry>
736
737 <varlistentry id="kill">
738 <term><command>kill</command></term>
739 <listitem>
740 <para>Sends signals to processes</para>
741 <indexterm zone="ch-system-util-linux kill">
742 <primary sortas="b-kill">kill</primary>
743 </indexterm>
744 </listitem>
745 </varlistentry>
746
747 <varlistentry id="last">
748 <term><command>last</command></term>
749 <listitem>
750 <para>Shows which users last logged in (and out), searching back
751 through the <filename>/var/log/wtmp</filename> file; it also shows
752 system boots, shutdowns, and run-level changes</para>
753 <indexterm zone="ch-system-util-linux last">
754 <primary sortas="b-last">last</primary>
755 </indexterm>
756 </listitem>
757 </varlistentry>
758
759 <varlistentry id="lastb">
760 <term><command>lastb</command></term>
761 <listitem>
762 <para>Shows the failed login attempts, as logged in
763 <filename>/var/log/btmp</filename></para>
764 <indexterm zone="ch-system-util-linux lastb">
765 <primary sortas="b-lastb">lastb</primary>
766 </indexterm>
767 </listitem>
768 </varlistentry>
769
770 <varlistentry id="ldattach">
771 <term><command>ldattach</command></term>
772 <listitem>
773 <para>Attaches a line discipline to a serial line</para>
774 <indexterm zone="ch-system-util-linux ldattach">
775 <primary sortas="b-ldattach">ldattach</primary>
776 </indexterm>
777 </listitem>
778 </varlistentry>
779
780 <varlistentry id="linux32">
781 <term><command>linux32</command></term>
782 <listitem>
783 <para>A symbolic link to setarch</para>
784 <indexterm zone="ch-system-util-linux linux32">
785 <primary sortas="b-linux32">linux32</primary>
786 </indexterm>
787 </listitem>
788 </varlistentry>
789
790 <varlistentry id="linux64">
791 <term><command>linux64</command></term>
792 <listitem>
793 <para>A symbolic link to setarch</para>
794 <indexterm zone="ch-system-util-linux linux64">
795 <primary sortas="b-linux64">linux64</primary>
796 </indexterm>
797 </listitem>
798 </varlistentry>
799
800 <varlistentry id="logger">
801 <term><command>logger</command></term>
802 <listitem>
803 <para>Enters the given message into the system log</para>
804 <indexterm zone="ch-system-util-linux logger">
805 <primary sortas="b-logger">logger</primary>
806 </indexterm>
807 </listitem>
808 </varlistentry>
809
810 <varlistentry id="look">
811 <term><command>look</command></term>
812 <listitem>
813 <para>Displays lines that begin with the given string</para>
814 <indexterm zone="ch-system-util-linux look">
815 <primary sortas="b-look">look</primary>
816 </indexterm>
817 </listitem>
818 </varlistentry>
819
820 <varlistentry id="losetup">
821 <term><command>losetup</command></term>
822 <listitem>
823 <para>Sets up and controls loop devices</para>
824 <indexterm zone="ch-system-util-linux losetup">
825 <primary sortas="b-losetup">losetup</primary>
826 </indexterm>
827 </listitem>
828 </varlistentry>
829
830 <varlistentry id="lsblk">
831 <term><command>lsblk</command></term>
832 <listitem>
833 <para>Lists information about all or selected block devices in
834 a tree-like format</para>
835 <indexterm zone="ch-system-util-linux lsblk">
836 <primary sortas="b-lsblk">lsblk</primary>
837 </indexterm>
838 </listitem>
839 </varlistentry>
840
841 <varlistentry id="lscpu">
842 <term><command>lscpu</command></term>
843 <listitem>
844 <para>Prints CPU architecture information</para>
845 <indexterm zone="ch-system-util-linux lscpu">
846 <primary sortas="b-lscpu">lscpu</primary>
847 </indexterm>
848 </listitem>
849 </varlistentry>
850
851 <varlistentry id="lsfd">
852 <term><command>lsfd</command></term>
853 <listitem>
854 <para>Displays information about open files; replaces <command>lsof</command></para>
855 <indexterm zone="ch-system-util-linux lsfd">
856 <primary sortas="b-lsfd">lsfd</primary>
857 </indexterm>
858 </listitem>
859 </varlistentry>
860
861 <varlistentry id="lsipc">
862 <term><command>lsipc</command></term>
863 <listitem>
864 <para>Prints information on IPC facilities currently employed
865 in the system</para>
866 <indexterm zone="ch-system-util-linux lsipc">
867 <primary sortas="b-lsipc">lsipc</primary>
868 </indexterm>
869 </listitem>
870 </varlistentry>
871
872 <varlistentry id="lsirq">
873 <term><command>lsirq</command></term>
874 <listitem>
875 <para>Displays kernel interrupt counter information</para>
876 <indexterm zone="ch-system-util-linux lsirq">
877 <primary sortas="b-lsirq">lsirq</primary>
878 </indexterm>
879 </listitem>
880 </varlistentry>
881
882 <varlistentry id="lslocks">
883 <term><command>lslocks</command></term>
884 <listitem>
885 <para>Lists local system locks</para>
886 <indexterm zone="ch-system-util-linux lslocks">
887 <primary sortas="b-lslocks">lslocks</primary>
888 </indexterm>
889 </listitem>
890 </varlistentry>
891
892 <varlistentry id="lslogins">
893 <term><command>lslogins</command></term>
894 <listitem>
895 <para>Lists information about users, groups and system accounts</para>
896 <indexterm zone="ch-system-util-linux lslogins">
897 <primary sortas="b-lslogins">lslogins</primary>
898 </indexterm>
899 </listitem>
900 </varlistentry>
901
902 <varlistentry id="lsmem">
903 <term><command>lsmem</command></term>
904 <listitem>
905 <para>Lists the ranges of available memory with their online
906 status</para>
907 <indexterm zone="ch-system-util-linux lsmem">
908 <primary sortas="b-lsmem">lsmem</primary>
909 </indexterm>
910 </listitem>
911 </varlistentry>
912
913 <varlistentry id="lsns">
914 <term><command>lsns</command></term>
915 <listitem>
916 <para>Lists namespaces</para>
917 <indexterm zone="ch-system-util-linux lsns">
918 <primary sortas="b-lsns">lsns</primary>
919 </indexterm>
920 </listitem>
921 </varlistentry>
922
923 <varlistentry id="mcookie">
924 <term><command>mcookie</command></term>
925 <listitem>
926 <para>Generates magic cookies (128-bit random hexadecimal numbers) for
927 <command>xauth</command></para>
928 <indexterm zone="ch-system-util-linux mcookie">
929 <primary sortas="b-mcookie">mcookie</primary>
930 </indexterm>
931 </listitem>
932 </varlistentry>
933
934 <varlistentry id="mesg">
935 <term><command>mesg</command></term>
936 <listitem>
937 <para>Controls whether other users can send messages to the current
938 user's terminal</para>
939 <indexterm zone="ch-system-util-linux mesg">
940 <primary sortas="b-mesg">mesg</primary>
941 </indexterm>
942 </listitem>
943 </varlistentry>
944
945 <varlistentry id="mkfs">
946 <term><command>mkfs</command></term>
947 <listitem>
948 <para>Builds a file system on a device (usually a hard disk
949 partition)</para>
950 <indexterm zone="ch-system-util-linux mkfs">
951 <primary sortas="b-mkfs">mkfs</primary>
952 </indexterm>
953 </listitem>
954 </varlistentry>
955
956 <varlistentry id="mkfs.bfs">
957 <term><command>mkfs.bfs</command></term>
958 <listitem>
959 <para>Creates a Santa Cruz Operations (SCO) bfs file system</para>
960 <indexterm zone="ch-system-util-linux mkfs.bfs">
961 <primary sortas="b-mkfs.bfs">mkfs.bfs</primary>
962 </indexterm>
963 </listitem>
964 </varlistentry>
965
966 <varlistentry id="mkfs.cramfs">
967 <term><command>mkfs.cramfs</command></term>
968 <listitem>
969 <para>Creates a cramfs file system</para>
970 <indexterm zone="ch-system-util-linux mkfs.cramfs">
971 <primary sortas="b-mkfs.cramfs">mkfs.cramfs</primary>
972 </indexterm>
973 </listitem>
974 </varlistentry>
975
976 <varlistentry id="mkfs.minix">
977 <term><command>mkfs.minix</command></term>
978 <listitem>
979 <para>Creates a Minix file system</para>
980 <indexterm zone="ch-system-util-linux mkfs.minix">
981 <primary sortas="b-mkfs.minix">mkfs.minix</primary>
982 </indexterm>
983 </listitem>
984 </varlistentry>
985
986 <varlistentry id="mkswap">
987 <term><command>mkswap</command></term>
988 <listitem>
989 <para>Initializes the given device or file to be used as a swap
990 area</para>
991 <indexterm zone="ch-system-util-linux mkswap">
992 <primary sortas="b-mkswap">mkswap</primary>
993 </indexterm>
994 </listitem>
995 </varlistentry>
996
997 <varlistentry id="more">
998 <term><command>more</command></term>
999 <listitem>
1000 <para>A filter for paging through text one screen at a time</para>
1001 <indexterm zone="ch-system-util-linux more">
1002 <primary sortas="b-more">more</primary>
1003 </indexterm>
1004 </listitem>
1005 </varlistentry>
1006
1007 <varlistentry id="mount">
1008 <term><command>mount</command></term>
1009 <listitem>
1010 <para>Attaches the file system on the given device to a specified
1011 directory in the file-system tree</para>
1012 <indexterm zone="ch-system-util-linux mount">
1013 <primary sortas="b-mount">mount</primary>
1014 </indexterm>
1015 </listitem>
1016 </varlistentry>
1017
1018 <varlistentry id="mountpoint">
1019 <term><command>mountpoint</command></term>
1020 <listitem>
1021 <para>Checks if the directory is a mountpoint</para>
1022 <indexterm zone="ch-system-util-linux mountpoint">
1023 <primary sortas="b-mountpoint">mountpoint</primary>
1024 </indexterm>
1025 </listitem>
1026 </varlistentry>
1027
1028 <varlistentry id="namei">
1029 <term><command>namei</command></term>
1030 <listitem>
1031 <para>Shows the symbolic links in the given paths</para>
1032 <indexterm zone="ch-system-util-linux namei">
1033 <primary sortas="b-namei">namei</primary>
1034 </indexterm>
1035 </listitem>
1036 </varlistentry>
1037
1038 <varlistentry id="nsenter">
1039 <term><command>nsenter</command></term>
1040 <listitem>
1041 <para>Runs a program with namespaces of other processes</para>
1042 <indexterm zone="ch-system-util-linux nsenter">
1043 <primary sortas="b-nsenter">nsenter</primary>
1044 </indexterm>
1045 </listitem>
1046 </varlistentry>
1047
1048 <varlistentry id="partx">
1049 <term><command>partx</command></term>
1050 <listitem>
1051 <para>Tells the kernel about the presence and numbering of on-disk
1052 partitions</para>
1053 <indexterm zone="ch-system-util-linux partx">
1054 <primary sortas="b-partx">partx</primary>
1055 </indexterm>
1056 </listitem>
1057 </varlistentry>
1058
1059 <varlistentry id="pivot_root">
1060 <term><command>pivot_root</command></term>
1061 <listitem>
1062 <para>Makes the given file system the new root file system of the
1063 current process</para>
1064 <indexterm zone="ch-system-util-linux pivot_root">
1065 <primary sortas="b-pivot_root">pivot_root</primary>
1066 </indexterm>
1067 </listitem>
1068 </varlistentry>
1069
1070 <varlistentry id="prlimit">
1071 <term><command>prlimit</command></term>
1072 <listitem>
1073 <para>Gets and sets a process's resource limits</para>
1074 <indexterm zone="ch-system-util-linux prlimit">
1075 <primary sortas="b-prlimit">prlimit</primary>
1076 </indexterm>
1077 </listitem>
1078 </varlistentry>
1079
1080 <varlistentry id="readprofile">
1081 <term><command>readprofile</command></term>
1082 <listitem>
1083 <para>Reads kernel profiling information</para>
1084 <indexterm zone="ch-system-util-linux readprofile">
1085 <primary sortas="b-readprofile">readprofile</primary>
1086 </indexterm>
1087 </listitem>
1088 </varlistentry>
1089
1090 <varlistentry id="rename">
1091 <term><command>rename</command></term>
1092 <listitem>
1093 <para>Renames the given files, replacing a given string with
1094 another</para>
1095 <indexterm zone="ch-system-util-linux rename">
1096 <primary sortas="b-rename">rename</primary>
1097 </indexterm>
1098 </listitem>
1099 </varlistentry>
1100
1101 <varlistentry id="renice">
1102 <term><command>renice</command></term>
1103 <listitem>
1104 <para>Alters the priority of running processes</para>
1105 <indexterm zone="ch-system-util-linux renice">
1106 <primary sortas="b-renice">renice</primary>
1107 </indexterm>
1108 </listitem>
1109 </varlistentry>
1110
1111 <varlistentry id="resizepart">
1112 <term><command>resizepart</command></term>
1113 <listitem>
1114 <para>Asks the Linux kernel to resize a partition</para>
1115 <indexterm zone="ch-system-util-linux resizepart">
1116 <primary sortas="b-resizepart">resizepart</primary>
1117 </indexterm>
1118 </listitem>
1119 </varlistentry>
1120
1121 <varlistentry id="rev">
1122 <term><command>rev</command></term>
1123 <listitem>
1124 <para>Reverses the lines of a given file</para>
1125 <indexterm zone="ch-system-util-linux rev">
1126 <primary sortas="b-rev">rev</primary>
1127 </indexterm>
1128 </listitem>
1129 </varlistentry>
1130
1131 <varlistentry id="rfkill">
1132 <term><command>rfkill</command></term>
1133 <listitem>
1134 <para>Tool for enabling and disabling wireless devices</para>
1135 <indexterm zone="ch-system-util-linux rfkill">
1136 <primary sortas="b-rfkill">rfkill</primary>
1137 </indexterm>
1138 </listitem>
1139 </varlistentry>
1140
1141 <varlistentry id="rtcwake">
1142 <term><command>rtcwake</command></term>
1143 <listitem>
1144 <para>Used to enter a system sleep state until the specified wakeup
1145 time</para>
1146 <indexterm zone="ch-system-util-linux rtcwake">
1147 <primary sortas="b-rtcwake">rtcwake</primary>
1148 </indexterm>
1149 </listitem>
1150 </varlistentry>
1151
1152 <varlistentry id="script">
1153 <term><command>script</command></term>
1154 <listitem>
1155 <para>Makes a typescript of a terminal session</para>
1156 <indexterm zone="ch-system-util-linux script">
1157 <primary sortas="b-script">script</primary>
1158 </indexterm>
1159 </listitem>
1160 </varlistentry>
1161
1162 <varlistentry id="scriptlive">
1163 <term><command>scriptlive</command></term>
1164 <listitem>
1165 <para>Re-runs session typescripts using timing information</para>
1166 <indexterm zone="ch-system-util-linux scriptlive">
1167 <primary sortas="b-scriptlive">scriptlive</primary>
1168 </indexterm>
1169 </listitem>
1170 </varlistentry>
1171
1172 <varlistentry id="scriptreplay">
1173 <term><command>scriptreplay</command></term>
1174 <listitem>
1175 <para>Plays back typescripts using timing information</para>
1176 <indexterm zone="ch-system-util-linux scriptreplay">
1177 <primary sortas="b-scriptreplay">scriptreplay</primary>
1178 </indexterm>
1179 </listitem>
1180 </varlistentry>
1181
1182 <varlistentry id="setarch">
1183 <term><command>setarch</command></term>
1184 <listitem>
1185 <para>Changes reported architecture in a new program environment, and
1186 sets personality flags</para>
1187 <indexterm zone="ch-system-util-linux setarch">
1188 <primary sortas="b-setarch">setarch</primary>
1189 </indexterm>
1190 </listitem>
1191 </varlistentry>
1192
1193 <varlistentry id="setsid">
1194 <term><command>setsid</command></term>
1195 <listitem>
1196 <para>Runs the given program in a new session</para>
1197 <indexterm zone="ch-system-util-linux setsid">
1198 <primary sortas="b-setsid">setsid</primary>
1199 </indexterm>
1200 </listitem>
1201 </varlistentry>
1202
1203 <varlistentry id="setterm">
1204 <term><command>setterm</command></term>
1205 <listitem>
1206 <para>Sets terminal attributes</para>
1207 <indexterm zone="ch-system-util-linux setterm">
1208 <primary sortas="b-setterm">setterm</primary>
1209 </indexterm>
1210 </listitem>
1211 </varlistentry>
1212
1213 <varlistentry id="sfdisk">
1214 <term><command>sfdisk</command></term>
1215 <listitem>
1216 <para>A disk partition table manipulator</para>
1217 <indexterm zone="ch-system-util-linux sfdisk">
1218 <primary sortas="b-sfdisk">sfdisk</primary>
1219 </indexterm>
1220 </listitem>
1221 </varlistentry>
1222
1223 <varlistentry id="sulogin">
1224 <term><command>sulogin</command></term>
1225 <listitem>
1226 <para>Allows <systemitem class="username">root</systemitem> to log in;
1227 it is normally invoked by <command>init</command> when the system goes
1228 into single user mode</para>
1229 <indexterm zone="ch-system-util-linux sulogin">
1230 <primary sortas="b-sulogin">sulogin</primary>
1231 </indexterm>
1232 </listitem>
1233 </varlistentry>
1234
1235 <varlistentry id="swaplabel">
1236 <term><command>swaplabel</command></term>
1237 <listitem>
1238 <para>Makes changes to the swap area's UUID and label</para>
1239 <indexterm zone="ch-system-util-linux swaplabel">
1240 <primary sortas="b-swaplabel">swaplabel</primary>
1241 </indexterm>
1242 </listitem>
1243 </varlistentry>
1244
1245 <varlistentry id="swapoff">
1246 <term><command>swapoff</command></term>
1247 <listitem>
1248 <para>Disables devices and files for paging and swapping</para>
1249 <indexterm zone="ch-system-util-linux swapoff">
1250 <primary sortas="b-swapoff">swapoff</primary>
1251 </indexterm>
1252 </listitem>
1253 </varlistentry>
1254
1255 <varlistentry id="swapon">
1256 <term><command>swapon</command></term>
1257 <listitem>
1258 <para>Enables devices and files for paging and swapping, and
1259 lists the devices and files currently in use</para>
1260 <indexterm zone="ch-system-util-linux swapon">
1261 <primary sortas="b-swapon">swapon</primary>
1262 </indexterm>
1263 </listitem>
1264 </varlistentry>
1265
1266 <varlistentry id="switch_root">
1267 <term><command>switch_root</command></term>
1268 <listitem>
1269 <para>Switches to another filesystem as the root of the mount tree</para>
1270 <indexterm zone="ch-system-util-linux switch_root">
1271 <primary sortas="b-switch_root">switch_root</primary>
1272 </indexterm>
1273 </listitem>
1274 </varlistentry>
1275
1276 <varlistentry id="taskset">
1277 <term><command>taskset</command></term>
1278 <listitem>
1279 <para>Retrieves or sets a process's CPU affinity</para>
1280 <indexterm zone="ch-system-util-linux taskset">
1281 <primary sortas="b-taskset">taskset</primary>
1282 </indexterm>
1283 </listitem>
1284 </varlistentry>
1285
1286 <varlistentry id="uclampset">
1287 <term><command>uclampset</command></term>
1288 <listitem>
1289 <para>Manipulates the utilization clamping attributes of the
1290 system or a process</para>
1291 <indexterm zone="ch-system-util-linux uclampset">
1292 <primary sortas="b-uclampset">uclampset</primary>
1293 </indexterm>
1294 </listitem>
1295 </varlistentry>
1296
1297 <varlistentry id="ul">
1298 <term><command>ul</command></term>
1299 <listitem>
1300 <para>A filter for translating underscores into escape sequences
1301 indicating underlining for the terminal in use</para>
1302 <indexterm zone="ch-system-util-linux ul">
1303 <primary sortas="b-ul">ul</primary>
1304 </indexterm>
1305 </listitem>
1306 </varlistentry>
1307
1308 <varlistentry id="umount">
1309 <term><command>umount</command></term>
1310 <listitem>
1311 <para>Disconnects a file system from the system's file tree</para>
1312 <indexterm zone="ch-system-util-linux umount">
1313 <primary sortas="b-umount">umount</primary>
1314 </indexterm>
1315 </listitem>
1316 </varlistentry>
1317
1318 <varlistentry id="uname26">
1319 <term><command>uname26</command></term>
1320 <listitem>
1321 <para>A symbolic link to setarch</para>
1322 <indexterm zone="ch-system-util-linux uname26">
1323 <primary sortas="b-uname26">uname26</primary>
1324 </indexterm>
1325 </listitem>
1326 </varlistentry>
1327
1328 <varlistentry id="unshare">
1329 <term><command>unshare</command></term>
1330 <listitem>
1331 <para>Runs a program with some namespaces unshared from parent</para>
1332 <indexterm zone="ch-system-util-linux unshare">
1333 <primary sortas="b-unshare">unshare</primary>
1334 </indexterm>
1335 </listitem>
1336 </varlistentry>
1337
1338 <varlistentry id="utmpdump">
1339 <term><command>utmpdump</command></term>
1340 <listitem>
1341 <para>Displays the content of the given login file in a
1342 user-friendly format</para>
1343 <indexterm zone="ch-system-util-linux utmpdump">
1344 <primary sortas="b-utmpdump">utmpdump</primary>
1345 </indexterm>
1346 </listitem>
1347 </varlistentry>
1348
1349 <varlistentry id="uuidd">
1350 <term><command>uuidd</command></term>
1351 <listitem>
1352 <para>A daemon used by the UUID library to generate time-based
1353 UUIDs in a secure and guaranteed-unique fashion</para>
1354 <indexterm zone="ch-system-util-linux uuidd">
1355 <primary sortas="b-uuidd">uuidd</primary>
1356 </indexterm>
1357 </listitem>
1358 </varlistentry>
1359
1360 <varlistentry id="uuidgen">
1361 <term><command>uuidgen</command></term>
1362 <listitem>
1363 <para>Creates new UUIDs. Each new UUID is a random number likely to be
1364 unique among all UUIDs created, on the local system and on other
1365 systems, in the past and in the future, with extremely high
1366 probability (2<superscript>128</superscript> UUIDs are
1367 possible)</para>
1368 <indexterm zone="ch-system-util-linux uuidgen">
1369 <primary sortas="b-uuidgen">uuidgen</primary>
1370 </indexterm>
1371 </listitem>
1372 </varlistentry>
1373
1374 <varlistentry id="uuidparse">
1375 <term><command>uuidparse</command></term>
1376 <listitem>
1377 <para>A utility to parse unique identifiers</para>
1378 <indexterm zone="ch-system-util-linux uuidparse">
1379 <primary sortas="b-uuidparse">uuidparse</primary>
1380 </indexterm>
1381 </listitem>
1382 </varlistentry>
1383
1384 <varlistentry id="wall">
1385 <term><command>wall</command></term>
1386 <listitem>
1387 <para>Displays the contents of a file or, by default, its standard
1388 input, on the terminals of all currently logged in users</para>
1389 <indexterm zone="ch-system-util-linux wall">
1390 <primary sortas="b-wall">wall</primary>
1391 </indexterm>
1392 </listitem>
1393 </varlistentry>
1394
1395 <varlistentry id="wdctl">
1396 <term><command>wdctl</command></term>
1397 <listitem>
1398 <para>Shows hardware watchdog status</para>
1399 <indexterm zone="ch-system-util-linux wdctl">
1400 <primary sortas="b-wdctl">wdctl</primary>
1401 </indexterm>
1402 </listitem>
1403 </varlistentry>
1404
1405 <varlistentry id="whereis">
1406 <term><command>whereis</command></term>
1407 <listitem>
1408 <para>Reports the location of the binary, source, and man page
1409 files for the given command</para>
1410 <indexterm zone="ch-system-util-linux whereis">
1411 <primary sortas="b-whereis">whereis</primary>
1412 </indexterm>
1413 </listitem>
1414 </varlistentry>
1415
1416 <varlistentry id="wipefs">
1417 <term><command>wipefs</command></term>
1418 <listitem>
1419 <para>Wipes a filesystem signature from a device</para>
1420 <indexterm zone="ch-system-util-linux wipefs">
1421 <primary sortas="b-wipefs">wipefs</primary>
1422 </indexterm>
1423 </listitem>
1424 </varlistentry>
1425
1426 <varlistentry id="x86_64">
1427 <term><command>x86_64</command></term>
1428 <listitem>
1429 <para>A symbolic link to setarch</para>
1430 <indexterm zone="ch-system-util-linux x86_64">
1431 <primary sortas="b-x86_64">x86_64</primary>
1432 </indexterm>
1433 </listitem>
1434 </varlistentry>
1435
1436 <varlistentry id="zramctl">
1437 <term><command>zramctl</command></term>
1438 <listitem>
1439 <para>A program to set up and control zram (compressed ram disk)
1440 devices</para>
1441 <indexterm zone="ch-system-util-linux zramctl">
1442 <primary sortas="b-zramctl">zramctl</primary>
1443 </indexterm>
1444 </listitem>
1445 </varlistentry>
1446
1447 <varlistentry id="libblkid">
1448 <term><filename class="libraryfile">libblkid</filename></term>
1449 <listitem>
1450 <para>Contains routines for device identification and token
1451 extraction</para>
1452 <indexterm zone="ch-system-util-linux libblkid">
1453 <primary sortas="c-libblkid">libblkid</primary>
1454 </indexterm>
1455 </listitem>
1456 </varlistentry>
1457
1458 <varlistentry id="libfdisk">
1459 <term><filename class="libraryfile">libfdisk</filename></term>
1460 <listitem>
1461 <para>Contains routines for manipulating partition tables</para>
1462 <indexterm zone="ch-system-util-linux libfdisk">
1463 <primary sortas="c-libfdisk">libfdisk</primary>
1464 </indexterm>
1465 </listitem>
1466 </varlistentry>
1467
1468 <varlistentry id="libmount">
1469 <term><filename class="libraryfile">libmount</filename></term>
1470 <listitem>
1471 <para>Contains routines for block device mounting and
1472 unmounting</para>
1473 <indexterm zone="ch-system-util-linux libmount">
1474 <primary sortas="c-libmount">libmount</primary>
1475 </indexterm>
1476 </listitem>
1477 </varlistentry>
1478
1479 <varlistentry id="libsmartcols">
1480 <term><filename class="libraryfile">libsmartcols</filename></term>
1481 <listitem>
1482 <para>Contains routines for aiding screen output in tabular form</para>
1483 <indexterm zone="ch-system-util-linux libsmartcols">
1484 <primary sortas="c-libsmartcols">libsmartcols</primary>
1485 </indexterm>
1486 </listitem>
1487 </varlistentry>
1488
1489 <varlistentry id="libuuid">
1490 <term><filename class="libraryfile">libuuid</filename></term>
1491 <listitem>
1492 <para>Contains routines for generating unique identifiers for objects
1493 that may be accessible beyond the local system</para>
1494 <indexterm zone="ch-system-util-linux libuuid">
1495 <primary sortas="c-libuuid">libuuid</primary>
1496 </indexterm>
1497 </listitem>
1498 </varlistentry>
1499
1500 </variablelist>
1501
1502 </sect2>
1503
1504</sect1>
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