source: chapter06/util-linux.xml@ 7fd302c

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Last change on this file since 7fd302c was 7fd302c, checked in by Bruce Dubbs <bdubbs@…>, 4 years ago

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1<?xml version="1.0" encoding="ISO-8859-1"?>
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-ch6-sbu;</seg>
36 <seg>&util-linux-ch6-du;</seg>
37 </seglistitem>
38 </segmentedlist>
39
40 </sect2>
41
42 <sect2 role="installation">
43 <title>FHS compliance notes</title>
44
45 <para>The FHS recommends using the <filename
46 class="directory">/var/lib/hwclock</filename> directory instead of the
47 usual <filename class="directory">/etc</filename> directory as the
48 location for the <filename>adjtime</filename> file. First create a directory
49 to enable storage for the <command>hwclock</command> program:</para>
50
51<screen><userinput remap="pre">mkdir -pv /var/lib/hwclock</userinput></screen>
52
53 </sect2>
54
55 <sect2 role="installation">
56 <title>Installation of Util-linux</title>
57<!--
58 <para>First, fix one of the regression tests:</para>
59
60<screen><userinput remap="pre">sed -e 's/2^64/(2^64/' -e 's/E &lt;/E) &lt;=/' -e 's/ne /eq /' \
61 -i tests/ts/ipcs/limits2</userinput></screen>
62-->
63
64 <para>Remove the earlier created symlinks and files:</para>
65
66<screen><userinput remap="pre">rm -vf /usr/include/{blkid,libfdisk,libmount,uuid}
67rm -vf /usr/lib/lib{blkid,fdisk,mount,uuid}.so*
68rm -vf /usr/lib/pkgconfig/{blkid,fdisk,mount,uuid}.pc</userinput></screen>
69
70 <para>Prepare Util-linux for compilation:</para>
71
72<screen revision="sysv"><userinput remap="configure">./configure ADJTIME_PATH=/var/lib/hwclock/adjtime \
73 --docdir=/usr/share/doc/util-linux-&util-linux-version; \
74 --disable-chfn-chsh \
75 --disable-login \
76 --disable-nologin \
77 --disable-su \
78 --disable-setpriv \
79 --disable-runuser \
80 --disable-pylibmount \
81 --disable-static \
82 --without-python \
83 --without-systemd \
84 --without-systemdsystemunitdir</userinput></screen>
85
86<screen revision="systemd"><userinput remap="configure">./configure ADJTIME_PATH=/var/lib/hwclock/adjtime \
87 --docdir=/usr/share/doc/util-linux-&util-linux-version; \
88 --disable-chfn-chsh \
89 --disable-login \
90 --disable-nologin \
91 --disable-su \
92 --disable-setpriv \
93 --disable-runuser \
94 --disable-pylibmount \
95 --disable-static \
96 --without-python</userinput></screen>
97
98 <para>The --disable and --without options prevent warnings about
99 building components that require packages not in LFS or are
100 inconsistent with programs installed by other packages.</para>
101
102 <para>Compile the package:</para>
103
104<screen><userinput remap="make">make</userinput></screen>
105
106 <para>If desired, run the test suite as a non-root user:</para>
107
108 <warning><para>Running the test suite as the root user can be harmful to
109 your system. To run it, the CONFIG_SCSI_DEBUG option for the kernel must
110 be available in the currently running system, and must be built as a
111 module. Building it into the kernel will prevent booting. For complete
112 coverage, other BLFS packages must be installed. If desired, this test can
113 be run after rebooting into the completed LFS system and running:</para>
114
115<screen role="nodump"><userinput>bash tests/run.sh --srcdir=$PWD --builddir=$PWD</userinput></screen>
116 </warning>
117
118<screen><userinput remap="test">chown -Rv nobody .
119su nobody -s /bin/bash -c "PATH=$PATH make -k check"</userinput></screen>
120
121 <para>Install the package:</para>
122
123<screen><userinput remap="install">make install</userinput></screen>
124
125 </sect2>
126
127 <sect2 id="contents-utillinux" role="content">
128 <title>Contents of Util-linux</title>
129
130 <segmentedlist>
131 <segtitle>Installed programs</segtitle>
132 <segtitle>Installed libraries</segtitle>
133 <segtitle>Installed directories</segtitle>
134
135 <seglistitem>
136 <seg>addpart, agetty, blkdiscard, blkid, blkzone, blockdev, cal, cfdisk, chcpu,
137 chmem, choom, chrt, col, colcrt, colrm, column, ctrlaltdel, delpart, dmesg,
138 eject, fallocate, fdformat, fdisk, fincore, findfs, findmnt, flock, fsck,
139 fsck.cramfs, fsck.minix, fsfreeze, fstrim, getopt, hexdump, hwclock,
140 i386, ionice, ipcmk, ipcrm, ipcs, isosize, kill, last, lastb (link to
141 last), ldattach, linux32, linux64, logger, look, losetup, lsblk, lscpu,
142 lsipc, lslocks, lslogins, lsmem, lsns, mcookie, mesg, mkfs, mkfs.bfs, mkfs.cramfs, mkfs.minix, mkswap,
143 more, mount, mountpoint, namei, nsenter, partx, pivot_root, prlimit, raw,
144 readprofile, rename, renice, resizepart, rev, rfkill, rtcwake, script,
145 scriptreplay, setarch, setsid, setterm, sfdisk, sulogin, swaplabel,
146 swapoff (link to swapon), swapon, switch_root, taskset, ul,
147 umount, uname26, unshare, utmpdump, uuidd, uuidgen, uuidparse, wall, wdctl, whereis,
148 wipefs, x86_64, and zramctl</seg>
149 <seg>libblkid.so, libfdisk.so, libmount.so,
150 libsmartcols.so, and libuuid.so</seg>
151 <seg>/usr/include/blkid,
152 /usr/include/libfdisk,
153 /usr/include/libmount,
154 /usr/include/libsmartcols,
155 /usr/include/uuid,
156 /usr/share/doc/util-linux-&util-linux-version;,
157 and /var/lib/hwclock</seg>
158 </seglistitem>
159 </segmentedlist>
160
161 <variablelist>
162 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
163 <?dbfo list-presentation="list"?>
164 <?dbhtml list-presentation="table"?>
165
166 <varlistentry id="addpart">
167 <term><command>addpart</command></term>
168 <listitem>
169 <para>Informs the Linux kernel of new partitions</para>
170 <indexterm zone="ch-system-util-linux addpart">
171 <primary sortas="b-addpart">addpart</primary>
172 </indexterm>
173 </listitem>
174 </varlistentry>
175
176 <varlistentry id="agetty">
177 <term><command>agetty</command></term>
178 <listitem>
179 <para>Opens a tty port, prompts for a login name,
180 and then invokes the <command>login</command> program</para>
181 <indexterm zone="ch-system-util-linux agetty">
182 <primary sortas="b-agetty">agetty</primary>
183 </indexterm>
184 </listitem>
185 </varlistentry>
186
187 <varlistentry id="blkdiscard">
188 <term><command>blkdiscard</command></term>
189 <listitem>
190 <para>Discards sectors on a device</para>
191 <indexterm zone="ch-system-util-linux blkdiscard">
192 <primary sortas="b-blkdiscard">blkdiscard</primary>
193 </indexterm>
194 </listitem>
195 </varlistentry>
196
197 <varlistentry id="blkid">
198 <term><command>blkid</command></term>
199 <listitem>
200 <para>A command line utility to locate and print block device
201 attributes</para>
202 <indexterm zone="ch-system-util-linux blkid">
203 <primary sortas="b-blkid">blkid</primary>
204 </indexterm>
205 </listitem>
206 </varlistentry>
207
208 <varlistentry id="blkzone">
209 <term><command>blkzone</command></term>
210 <listitem>
211 <para>Runs zone command on the given block device</para>
212 <indexterm zone="ch-system-util-linux blkzone">
213 <primary sortas="b-blkzone">blkzone</primary>
214 </indexterm>
215 </listitem>
216 </varlistentry>
217
218 <varlistentry id="blockdev">
219 <term><command>blockdev</command></term>
220 <listitem>
221 <para>Allows users to call block device ioctls from the command
222 line</para>
223 <indexterm zone="ch-system-util-linux blockdev">
224 <primary sortas="b-blockdev">blockdev</primary>
225 </indexterm>
226 </listitem>
227 </varlistentry>
228
229 <varlistentry id="cal">
230 <term><command>cal</command></term>
231 <listitem>
232 <para>Displays a simple calendar</para>
233 <indexterm zone="ch-system-util-linux cal">
234 <primary sortas="b-cal">cal</primary>
235 </indexterm>
236 </listitem>
237 </varlistentry>
238
239 <varlistentry id="cfdisk">
240 <term><command>cfdisk</command></term>
241 <listitem>
242 <para>Manipulates the partition table of the given device</para>
243 <indexterm zone="ch-system-util-linux cfdisk">
244 <primary sortas="b-cfdisk">cfdisk</primary>
245 </indexterm>
246 </listitem>
247 </varlistentry>
248
249 <varlistentry id="chcpu">
250 <term><command>chcpu</command></term>
251 <listitem>
252 <para>Modifies the state of CPUs</para>
253 <indexterm zone="ch-system-util-linux chcpu">
254 <primary sortas="b-chcpu">chcpu</primary>
255 </indexterm>
256 </listitem>
257 </varlistentry>
258
259 <varlistentry id="chmem">
260 <term><command>chmem</command></term>
261 <listitem>
262 <para>Configures memory</para>
263 <indexterm zone="ch-system-util-linux chmem">
264 <primary sortas="b-chmem">chmem</primary>
265 </indexterm>
266 </listitem>
267 </varlistentry>
268
269 <varlistentry id="choom">
270 <term><command>choom</command></term>
271 <listitem>
272 <para>Displays and adjusts OOM-killer score</para>
273 <indexterm zone="ch-system-util-linux choom">
274 <primary sortas="b-choom">choom</primary>
275 </indexterm>
276 </listitem>
277 </varlistentry>
278
279 <varlistentry id="chrt">
280 <term><command>chrt</command></term>
281 <listitem>
282 <para>Manipulates real-time attributes of a process</para>
283 <indexterm zone="ch-system-util-linux chrt">
284 <primary sortas="b-chrt">chrt</primary>
285 </indexterm>
286 </listitem>
287 </varlistentry>
288
289 <varlistentry id="col">
290 <term><command>col</command></term>
291 <listitem>
292 <para>Filters out reverse line feeds</para>
293 <indexterm zone="ch-system-util-linux col">
294 <primary sortas="b-col">col</primary>
295 </indexterm>
296 </listitem>
297 </varlistentry>
298
299 <varlistentry id="colcrt">
300 <term><command>colcrt</command></term>
301 <listitem>
302 <para>Filters <command>nroff</command> output for terminals
303 that lack some capabilities, such as overstriking and half-lines</para>
304 <indexterm zone="ch-system-util-linux colcrt">
305 <primary sortas="b-colcrt">colcrt</primary>
306 </indexterm>
307 </listitem>
308 </varlistentry>
309
310 <varlistentry id="colrm">
311 <term><command>colrm</command></term>
312 <listitem>
313 <para>Filters out the given columns</para>
314 <indexterm zone="ch-system-util-linux colrm">
315 <primary sortas="b-colrm">colrm</primary>
316 </indexterm>
317 </listitem>
318 </varlistentry>
319
320 <varlistentry id="column">
321 <term><command>column</command></term>
322 <listitem>
323 <para>Formats a given file into multiple columns</para>
324 <indexterm zone="ch-system-util-linux column">
325 <primary sortas="b-column">column</primary>
326 </indexterm>
327 </listitem>
328 </varlistentry>
329
330 <varlistentry id="ctrlaltdel">
331 <term><command>ctrlaltdel</command></term>
332 <listitem>
333 <para>Sets the function of the Ctrl+Alt+Del key combination to a
334 hard or a soft reset</para>
335 <indexterm zone="ch-system-util-linux ctrlaltdel">
336 <primary sortas="b-ctrlaltdel">ctrlaltdel</primary>
337 </indexterm>
338 </listitem>
339 </varlistentry>
340
341 <varlistentry id="delpart">
342 <term><command>delpart</command></term>
343 <listitem>
344 <para>Asks the Linux kernel to remove a partition</para>
345 <indexterm zone="ch-system-util-linux delpart">
346 <primary sortas="b-delpart">delpart</primary>
347 </indexterm>
348 </listitem>
349 </varlistentry>
350
351 <varlistentry id="dmesg">
352 <term><command>dmesg</command></term>
353 <listitem>
354 <para>Dumps the kernel boot messages</para>
355 <indexterm zone="ch-system-util-linux dmesg">
356 <primary sortas="b-dmesg">dmesg</primary>
357 </indexterm>
358 </listitem>
359 </varlistentry>
360
361 <varlistentry id="eject">
362 <term><command>eject</command></term>
363 <listitem>
364 <para>Ejects removable media</para>
365 <indexterm zone="ch-system-util-linux eject">
366 <primary sortas="b-eject">eject</primary>
367 </indexterm>
368 </listitem>
369 </varlistentry>
370
371 <varlistentry id="fallocate">
372 <term><command>fallocate</command></term>
373 <listitem>
374 <para>Preallocates space to a file</para>
375 <indexterm zone="ch-system-util-linux fallocate">
376 <primary sortas="b-fallocate">fallocate</primary>
377 </indexterm>
378 </listitem>
379 </varlistentry>
380
381 <varlistentry id="fdformat">
382 <term><command>fdformat</command></term>
383 <listitem>
384 <para>Low-level formats a floppy disk</para>
385 <indexterm zone="ch-system-util-linux fdformat">
386 <primary sortas="b-fdformat">fdformat</primary>
387 </indexterm>
388 </listitem>
389 </varlistentry>
390
391 <varlistentry id="fdisk">
392 <term><command>fdisk</command></term>
393 <listitem>
394 <para>Manipulates the partition table of the given device</para>
395 <indexterm zone="ch-system-util-linux fdisk">
396 <primary sortas="b-fdisk">fdisk</primary>
397 </indexterm>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry id="fincore">
402 <term><command>fincore</command></term>
403 <listitem>
404 <para>Counts pages of file contents in core</para>
405 <indexterm zone="ch-system-util-linux fincore">
406 <primary sortas="b-fincore">fincore</primary>
407 </indexterm>
408 </listitem>
409 </varlistentry>
410
411 <varlistentry id="findfs">
412 <term><command>findfs</command></term>
413 <listitem>
414 <para>Finds a file system by label or Universally Unique Identifier
415 (UUID)</para>
416 <indexterm zone="ch-system-util-linux findfs">
417 <primary sortas="b-findfs">findfs</primary>
418 </indexterm>
419 </listitem>
420 </varlistentry>
421
422 <varlistentry id="findmnt">
423 <term><command>findmnt</command></term>
424 <listitem>
425 <para>Is a command line interface to the libmount library
426 for work with mountinfo, fstab and mtab files</para>
427 <indexterm zone="ch-system-util-linux findmnt">
428 <primary sortas="b-findmnt">findmnt</primary>
429 </indexterm>
430 </listitem>
431 </varlistentry>
432
433 <varlistentry id="flock">
434 <term><command>flock</command></term>
435 <listitem>
436 <para>Acquires a file lock and then executes a command with the lock
437 held</para>
438 <indexterm zone="ch-system-util-linux flock">
439 <primary sortas="b-flock">flock</primary>
440 </indexterm>
441 </listitem>
442 </varlistentry>
443
444 <varlistentry id="fsck">
445 <term><command>fsck</command></term>
446 <listitem>
447 <para>Is used to check, and optionally repair, file systems</para>
448 <indexterm zone="ch-system-util-linux fsck">
449 <primary sortas="b-fsck">fsck</primary>
450 </indexterm>
451 </listitem>
452 </varlistentry>
453
454 <varlistentry id="fsck.cramfs">
455 <term><command>fsck.cramfs</command></term>
456 <listitem>
457 <para>Performs a consistency check on the Cramfs file system on the
458 given device</para>
459 <indexterm zone="ch-system-util-linux fsck.cramfs">
460 <primary sortas="b-fsck.cramfs">fsck.cramfs</primary>
461 </indexterm>
462 </listitem>
463 </varlistentry>
464
465 <varlistentry id="fsck.minix">
466 <term><command>fsck.minix</command></term>
467 <listitem>
468 <para>Performs a consistency check on the Minix file system on the
469 given device</para>
470 <indexterm zone="ch-system-util-linux fsck.minix">
471 <primary sortas="b-fsck.minix">fsck.minix</primary>
472 </indexterm>
473 </listitem>
474 </varlistentry>
475
476 <varlistentry id="fsfreeze">
477 <term><command>fsfreeze</command></term>
478 <listitem>
479 <para>Is a very simple wrapper around FIFREEZE/FITHAW ioctl
480 kernel driver operations</para>
481 <indexterm zone="ch-system-util-linux fsfreeze">
482 <primary sortas="b-fsfreeze">fsfreeze</primary>
483 </indexterm>
484 </listitem>
485 </varlistentry>
486
487 <varlistentry id="fstrim">
488 <term><command>fstrim</command></term>
489 <listitem>
490 <para>Discards unused blocks on a mounted filesystem</para>
491 <indexterm zone="ch-system-util-linux fstrim">
492 <primary sortas="b-fstrim">fstrim</primary>
493 </indexterm>
494 </listitem>
495 </varlistentry>
496
497 <varlistentry id="getopt">
498 <term><command>getopt</command></term>
499 <listitem>
500 <para>Parses options in the given command line</para>
501 <indexterm zone="ch-system-util-linux getopt">
502 <primary sortas="b-getopt">getopt</primary>
503 </indexterm>
504 </listitem>
505 </varlistentry>
506
507 <varlistentry id="hexdump">
508 <term><command>hexdump</command></term>
509 <listitem>
510 <para>Dumps the given file in hexadecimal or in another given
511 format</para>
512 <indexterm zone="ch-system-util-linux hexdump">
513 <primary sortas="b-hexdump">hexdump</primary>
514 </indexterm>
515 </listitem>
516 </varlistentry>
517
518 <varlistentry id="hwclock">
519 <term><command>hwclock</command></term>
520 <listitem>
521 <para>Reads or sets the system's hardware clock, also called
522 the Real-Time Clock (RTC) or Basic Input-Output System (BIOS)
523 clock</para>
524 <indexterm zone="ch-system-util-linux hwclock">
525 <primary sortas="b-hwclock">hwclock</primary>
526 </indexterm>
527 </listitem>
528 </varlistentry>
529
530 <varlistentry id="i386">
531 <term><command>i386</command></term>
532 <listitem>
533 <para>A symbolic link to setarch</para>
534 <indexterm zone="ch-system-util-linux i386">
535 <primary sortas="b-i386">i386</primary>
536 </indexterm>
537 </listitem>
538 </varlistentry>
539
540 <varlistentry id="ionice">
541 <term><command>ionice</command></term>
542 <listitem>
543 <para>Gets or sets the io scheduling class and priority for a program</para>
544 <indexterm zone="ch-system-util-linux ionice">
545 <primary sortas="b-ionice">ionice</primary>
546 </indexterm>
547 </listitem>
548 </varlistentry>
549
550 <varlistentry id="ipcmk">
551 <term><command>ipcmk</command></term>
552 <listitem>
553 <para>Creates various IPC resources</para>
554 <indexterm zone="ch-system-util-linux ipcmk">
555 <primary sortas="b-ipcmk">ipcmk</primary>
556 </indexterm>
557 </listitem>
558 </varlistentry>
559
560 <varlistentry id="ipcrm">
561 <term><command>ipcrm</command></term>
562 <listitem>
563 <para>Removes the given Inter-Process Communication (IPC) resource</para>
564 <indexterm zone="ch-system-util-linux ipcrm">
565 <primary sortas="b-ipcrm">ipcrm</primary>
566 </indexterm>
567 </listitem>
568 </varlistentry>
569
570 <varlistentry id="ipcs">
571 <term><command>ipcs</command></term>
572 <listitem>
573 <para>Provides IPC status information</para>
574 <indexterm zone="ch-system-util-linux ipcs">
575 <primary sortas="b-ipcs">ipcs</primary>
576 </indexterm>
577 </listitem>
578 </varlistentry>
579
580 <varlistentry id="isosize">
581 <term><command>isosize</command></term>
582 <listitem>
583 <para>Reports the size of an iso9660 file system</para>
584 <indexterm zone="ch-system-util-linux isosize">
585 <primary sortas="b-isosize">isosize</primary>
586 </indexterm>
587 </listitem>
588 </varlistentry>
589
590 <varlistentry id="kill">
591 <term><command>kill</command></term>
592 <listitem>
593 <para>Sends signals to processes</para>
594 <indexterm zone="ch-system-util-linux kill">
595 <primary sortas="b-kill">kill</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="last">
601 <term><command>last</command></term>
602 <listitem>
603 <para>Shows which users last logged in (and out), searching back
604 through the <filename>/var/log/wtmp</filename> file; it also shows
605 system boots, shutdowns, and run-level changes</para>
606 <indexterm zone="ch-system-util-linux last">
607 <primary sortas="b-last">last</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry>
611
612 <varlistentry id="lastb">
613 <term><command>lastb</command></term>
614 <listitem>
615 <para>Shows the failed login attempts, as logged in
616 <filename>/var/log/btmp</filename></para>
617 <indexterm zone="ch-system-util-linux lastb">
618 <primary sortas="b-lastb">lastb</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <varlistentry id="ldattach">
624 <term><command>ldattach</command></term>
625 <listitem>
626 <para>Attaches a line discipline to a serial line</para>
627 <indexterm zone="ch-system-util-linux ldattach">
628 <primary sortas="b-ldattach">ldattach</primary>
629 </indexterm>
630 </listitem>
631 </varlistentry>
632
633 <varlistentry id="linux32">
634 <term><command>linux32</command></term>
635 <listitem>
636 <para>A symbolic link to setarch</para>
637 <indexterm zone="ch-system-util-linux linux32">
638 <primary sortas="b-linux32">linux32</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 <varlistentry id="linux64">
644 <term><command>linux64</command></term>
645 <listitem>
646 <para>A symbolic link to setarch</para>
647 <indexterm zone="ch-system-util-linux linux64">
648 <primary sortas="b-linux64">linux64</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="logger">
654 <term><command>logger</command></term>
655 <listitem>
656 <para>Enters the given message into the system log</para>
657 <indexterm zone="ch-system-util-linux logger">
658 <primary sortas="b-logger">logger</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="look">
664 <term><command>look</command></term>
665 <listitem>
666 <para>Displays lines that begin with the given string</para>
667 <indexterm zone="ch-system-util-linux look">
668 <primary sortas="b-look">look</primary>
669 </indexterm>
670 </listitem>
671 </varlistentry>
672
673 <varlistentry id="losetup">
674 <term><command>losetup</command></term>
675 <listitem>
676 <para>Sets up and controls loop devices</para>
677 <indexterm zone="ch-system-util-linux losetup">
678 <primary sortas="b-losetup">losetup</primary>
679 </indexterm>
680 </listitem>
681 </varlistentry>
682
683 <varlistentry id="lsblk">
684 <term><command>lsblk</command></term>
685 <listitem>
686 <para>Lists information about all or selected block devices in
687 a tree-like format</para>
688 <indexterm zone="ch-system-util-linux lsblk">
689 <primary sortas="b-lsblk">lsblk</primary>
690 </indexterm>
691 </listitem>
692 </varlistentry>
693
694 <varlistentry id="lscpu">
695 <term><command>lscpu</command></term>
696 <listitem>
697 <para>Prints CPU architecture information</para>
698 <indexterm zone="ch-system-util-linux lscpu">
699 <primary sortas="b-lscpu">lscpu</primary>
700 </indexterm>
701 </listitem>
702 </varlistentry>
703
704 <varlistentry id="lsipc">
705 <term><command>lsipc</command></term>
706 <listitem>
707 <para>Prints information on IPC facilities currently employed
708 in the system</para>
709 <indexterm zone="ch-system-util-linux lsipc">
710 <primary sortas="b-lsipc">lsipc</primary>
711 </indexterm>
712 </listitem>
713 </varlistentry>
714
715 <varlistentry id="lslocks">
716 <term><command>lslocks</command></term>
717 <listitem>
718 <para>Lists local system locks</para>
719 <indexterm zone="ch-system-util-linux lslocks">
720 <primary sortas="b-lslocks">lslocks</primary>
721 </indexterm>
722 </listitem>
723 </varlistentry>
724
725 <varlistentry id="lslogins">
726 <term><command>lslogins</command></term>
727 <listitem>
728 <para>Lists information about users, groups and system accounts</para>
729 <indexterm zone="ch-system-util-linux lslogins">
730 <primary sortas="b-lslogins">lslogins</primary>
731 </indexterm>
732 </listitem>
733 </varlistentry>
734
735 <varlistentry id="lsmem">
736 <term><command>lsmem</command></term>
737 <listitem>
738 <para>Lists the ranges of available memory with their online
739 status</para>
740 <indexterm zone="ch-system-util-linux lsmem">
741 <primary sortas="b-lsmem">lsmem</primary>
742 </indexterm>
743 </listitem>
744 </varlistentry>
745
746 <varlistentry id="lsns">
747 <term><command>lsns</command></term>
748 <listitem>
749 <para>Lists namespaces</para>
750 <indexterm zone="ch-system-util-linux lsns">
751 <primary sortas="b-lsns">lsns</primary>
752 </indexterm>
753 </listitem>
754 </varlistentry>
755
756 <varlistentry id="mcookie">
757 <term><command>mcookie</command></term>
758 <listitem>
759 <para>Generates magic cookies (128-bit random hexadecimal numbers) for
760 <command>xauth</command></para>
761 <indexterm zone="ch-system-util-linux mcookie">
762 <primary sortas="b-mcookie">mcookie</primary>
763 </indexterm>
764 </listitem>
765 </varlistentry>
766
767 <varlistentry id="mesg">
768 <term><command>mesg</command></term>
769 <listitem>
770 <para>Controls whether other users can send messages to the current
771 user's terminal</para>
772 <indexterm zone="ch-system-util-linux mesg">
773 <primary sortas="b-mesg">mesg</primary>
774 </indexterm>
775 </listitem>
776 </varlistentry>
777
778 <varlistentry id="mkfs">
779 <term><command>mkfs</command></term>
780 <listitem>
781 <para>Builds a file system on a device (usually a hard disk
782 partition)</para>
783 <indexterm zone="ch-system-util-linux mkfs">
784 <primary sortas="b-mkfs">mkfs</primary>
785 </indexterm>
786 </listitem>
787 </varlistentry>
788
789 <varlistentry id="mkfs.bfs">
790 <term><command>mkfs.bfs</command></term>
791 <listitem>
792 <para>Creates a Santa Cruz Operations (SCO) bfs file system</para>
793 <indexterm zone="ch-system-util-linux mkfs.bfs">
794 <primary sortas="b-mkfs.bfs">mkfs.bfs</primary>
795 </indexterm>
796 </listitem>
797 </varlistentry>
798
799 <varlistentry id="mkfs.cramfs">
800 <term><command>mkfs.cramfs</command></term>
801 <listitem>
802 <para>Creates a cramfs file system</para>
803 <indexterm zone="ch-system-util-linux mkfs.cramfs">
804 <primary sortas="b-mkfs.cramfs">mkfs.cramfs</primary>
805 </indexterm>
806 </listitem>
807 </varlistentry>
808
809 <varlistentry id="mkfs.minix">
810 <term><command>mkfs.minix</command></term>
811 <listitem>
812 <para>Creates a Minix file system</para>
813 <indexterm zone="ch-system-util-linux mkfs.minix">
814 <primary sortas="b-mkfs.minix">mkfs.minix</primary>
815 </indexterm>
816 </listitem>
817 </varlistentry>
818
819 <varlistentry id="mkswap">
820 <term><command>mkswap</command></term>
821 <listitem>
822 <para>Initializes the given device or file to be used as a swap
823 area</para>
824 <indexterm zone="ch-system-util-linux mkswap">
825 <primary sortas="b-mkswap">mkswap</primary>
826 </indexterm>
827 </listitem>
828 </varlistentry>
829
830 <varlistentry id="more">
831 <term><command>more</command></term>
832 <listitem>
833 <para>A filter for paging through text one screen at a time</para>
834 <indexterm zone="ch-system-util-linux more">
835 <primary sortas="b-more">more</primary>
836 </indexterm>
837 </listitem>
838 </varlistentry>
839
840 <varlistentry id="mount">
841 <term><command>mount</command></term>
842 <listitem>
843 <para>Attaches the file system on the given device to a specified
844 directory in the file-system tree</para>
845 <indexterm zone="ch-system-util-linux mount">
846 <primary sortas="b-mount">mount</primary>
847 </indexterm>
848 </listitem>
849 </varlistentry>
850
851 <varlistentry id="mountpoint">
852 <term><command>mountpoint</command></term>
853 <listitem>
854 <para>Checks if the directory is a mountpoint</para>
855 <indexterm zone="ch-system-util-linux mountpoint">
856 <primary sortas="b-mountpoint">mountpoint</primary>
857 </indexterm>
858 </listitem>
859 </varlistentry>
860
861 <varlistentry id="namei">
862 <term><command>namei</command></term>
863 <listitem>
864 <para>Shows the symbolic links in the given pathnames</para>
865 <indexterm zone="ch-system-util-linux namei">
866 <primary sortas="b-namei">namei</primary>
867 </indexterm>
868 </listitem>
869 </varlistentry>
870
871 <varlistentry id="nsenter">
872 <term><command>nsenter</command></term>
873 <listitem>
874 <para>Runs a program with namespaces of other processes</para>
875 <indexterm zone="ch-system-util-linux nsenter">
876 <primary sortas="b-nsenter">nsenter</primary>
877 </indexterm>
878 </listitem>
879 </varlistentry>
880
881 <varlistentry id="partx">
882 <term><command>partx</command></term>
883 <listitem>
884 <para>Tells the kernel about the presence and numbering of on-disk
885 partitions</para>
886 <indexterm zone="ch-system-util-linux partx">
887 <primary sortas="b-partx">partx</primary>
888 </indexterm>
889 </listitem>
890 </varlistentry>
891
892 <varlistentry id="pivot_root">
893 <term><command>pivot_root</command></term>
894 <listitem>
895 <para>Makes the given file system the new root file system of the
896 current process</para>
897 <indexterm zone="ch-system-util-linux pivot_root">
898 <primary sortas="b-pivot_root">pivot_root</primary>
899 </indexterm>
900 </listitem>
901 </varlistentry>
902
903 <varlistentry id="prlimit">
904 <term><command>prlimit</command></term>
905 <listitem>
906 <para>Get and set a process' resource limits</para>
907 <indexterm zone="ch-system-util-linux prlimit">
908 <primary sortas="b-prlimit">prlimit</primary>
909 </indexterm>
910 </listitem>
911 </varlistentry>
912
913 <varlistentry id="raw">
914 <term><command>raw</command></term>
915 <listitem>
916 <para>Bind a Linux raw character device to a block device</para>
917 <indexterm zone="ch-system-util-linux raw">
918 <primary sortas="b-raw">raw</primary>
919 </indexterm>
920 </listitem>
921 </varlistentry>
922
923 <varlistentry id="readprofile">
924 <term><command>readprofile</command></term>
925 <listitem>
926 <para>Reads kernel profiling information</para>
927 <indexterm zone="ch-system-util-linux readprofile">
928 <primary sortas="b-readprofile">readprofile</primary>
929 </indexterm>
930 </listitem>
931 </varlistentry>
932
933 <varlistentry id="rename">
934 <term><command>rename</command></term>
935 <listitem>
936 <para>Renames the given files, replacing a given string with
937 another</para>
938 <indexterm zone="ch-system-util-linux rename">
939 <primary sortas="b-rename">rename</primary>
940 </indexterm>
941 </listitem>
942 </varlistentry>
943
944 <varlistentry id="renice">
945 <term><command>renice</command></term>
946 <listitem>
947 <para>Alters the priority of running processes</para>
948 <indexterm zone="ch-system-util-linux renice">
949 <primary sortas="b-renice">renice</primary>
950 </indexterm>
951 </listitem>
952 </varlistentry>
953
954 <varlistentry id="resizepart">
955 <term><command>resizepart</command></term>
956 <listitem>
957 <para>Asks the Linux kernel to resize a partition</para>
958 <indexterm zone="ch-system-util-linux resizepart">
959 <primary sortas="b-resizepart">resizepart</primary>
960 </indexterm>
961 </listitem>
962 </varlistentry>
963
964 <varlistentry id="rev">
965 <term><command>rev</command></term>
966 <listitem>
967 <para>Reverses the lines of a given file</para>
968 <indexterm zone="ch-system-util-linux rev">
969 <primary sortas="b-rev">rev</primary>
970 </indexterm>
971 </listitem>
972 </varlistentry>
973
974 <varlistentry id="rkfill">
975 <term><command>rkfill</command></term>
976 <listitem>
977 <para>Tool for enabling and disabling wireless devices</para>
978 <indexterm zone="ch-system-util-linux rkfill">
979 <primary sortas="b-rkfill">rkfill</primary>
980 </indexterm>
981 </listitem>
982 </varlistentry>
983
984 <varlistentry id="rtcwake">
985 <term><command>rtcwake</command></term>
986 <listitem>
987 <para>Used to enter a system sleep state until specified wakeup
988 time</para>
989 <indexterm zone="ch-system-util-linux rtcwake">
990 <primary sortas="b-rtcwake">rtcwake</primary>
991 </indexterm>
992 </listitem>
993 </varlistentry>
994
995 <varlistentry id="script">
996 <term><command>script</command></term>
997 <listitem>
998 <para>Makes a typescript of a terminal session</para>
999 <indexterm zone="ch-system-util-linux script">
1000 <primary sortas="b-script">script</primary>
1001 </indexterm>
1002 </listitem>
1003 </varlistentry>
1004
1005 <varlistentry id="scriptreplay">
1006 <term><command>scriptreplay</command></term>
1007 <listitem>
1008 <para>Plays back typescripts using timing information</para>
1009 <indexterm zone="ch-system-util-linux scriptreplay">
1010 <primary sortas="b-scriptreplay">scriptreplay</primary>
1011 </indexterm>
1012 </listitem>
1013 </varlistentry>
1014
1015 <varlistentry id="setarch">
1016 <term><command>setarch</command></term>
1017 <listitem>
1018 <para>Changes reported architecture in a new program environment and
1019 sets personality flags</para>
1020 <indexterm zone="ch-system-util-linux setarch">
1021 <primary sortas="b-setarch">setarch</primary>
1022 </indexterm>
1023 </listitem>
1024 </varlistentry>
1025
1026 <varlistentry id="setsid">
1027 <term><command>setsid</command></term>
1028 <listitem>
1029 <para>Runs the given program in a new session</para>
1030 <indexterm zone="ch-system-util-linux setsid">
1031 <primary sortas="b-setsid">setsid</primary>
1032 </indexterm>
1033 </listitem>
1034 </varlistentry>
1035
1036 <varlistentry id="setterm">
1037 <term><command>setterm</command></term>
1038 <listitem>
1039 <para>Sets terminal attributes</para>
1040 <indexterm zone="ch-system-util-linux setterm">
1041 <primary sortas="b-setterm">setterm</primary>
1042 </indexterm>
1043 </listitem>
1044 </varlistentry>
1045
1046 <varlistentry id="sfdisk">
1047 <term><command>sfdisk</command></term>
1048 <listitem>
1049 <para>A disk partition table manipulator</para>
1050 <indexterm zone="ch-system-util-linux sfdisk">
1051 <primary sortas="b-sfdisk">sfdisk</primary>
1052 </indexterm>
1053 </listitem>
1054 </varlistentry>
1055
1056 <varlistentry id="sulogin">
1057 <term><command>sulogin</command></term>
1058 <listitem>
1059 <para>Allows <systemitem class="username">root</systemitem> to log in;
1060 it is normally invoked by <command>init</command> when the system goes
1061 into single user mode</para>
1062 <indexterm zone="ch-system-util-linux sulogin">
1063 <primary sortas="b-sulogin">sulogin</primary>
1064 </indexterm>
1065 </listitem>
1066 </varlistentry>
1067
1068 <varlistentry id="swaplabel">
1069 <term><command>swaplabel</command></term>
1070 <listitem>
1071 <para>Allows to change swaparea UUID and label</para>
1072 <indexterm zone="ch-system-util-linux swaplabel">
1073 <primary sortas="b-swaplabel">swaplabel</primary>
1074 </indexterm>
1075 </listitem>
1076 </varlistentry>
1077
1078 <varlistentry id="swapoff">
1079 <term><command>swapoff</command></term>
1080 <listitem>
1081 <para>Disables devices and files for paging and swapping</para>
1082 <indexterm zone="ch-system-util-linux swapoff">
1083 <primary sortas="b-swapoff">swapoff</primary>
1084 </indexterm>
1085 </listitem>
1086 </varlistentry>
1087
1088 <varlistentry id="swapon">
1089 <term><command>swapon</command></term>
1090 <listitem>
1091 <para>Enables devices and files for paging and swapping and
1092 lists the devices and files currently in use</para>
1093 <indexterm zone="ch-system-util-linux swapon">
1094 <primary sortas="b-swapon">swapon</primary>
1095 </indexterm>
1096 </listitem>
1097 </varlistentry>
1098
1099 <varlistentry id="switch_root">
1100 <term><command>switch_root</command></term>
1101 <listitem>
1102 <para>Switches to another filesystem as the root of the mount tree</para>
1103 <indexterm zone="ch-system-util-linux switch_root">
1104 <primary sortas="b-switch_root">switch_root</primary>
1105 </indexterm>
1106 </listitem>
1107 </varlistentry>
1108
1109 <varlistentry id="tailf">
1110 <term><command>tailf</command></term>
1111 <listitem>
1112 <para>Tracks the growth of a log file; displays the last 10 lines
1113 of a log file, then continues displaying any new entries in the
1114 log file as they are created</para>
1115 <indexterm zone="ch-system-util-linux tailf">
1116 <primary sortas="b-tailf">tailf</primary>
1117 </indexterm>
1118 </listitem>
1119 </varlistentry>
1120
1121 <varlistentry id="taskset">
1122 <term><command>taskset</command></term>
1123 <listitem>
1124 <para>Retrieves or sets a process' CPU affinity</para>
1125 <indexterm zone="ch-system-util-linux taskset">
1126 <primary sortas="b-taskset">taskset</primary>
1127 </indexterm>
1128 </listitem>
1129 </varlistentry>
1130
1131 <varlistentry id="ul">
1132 <term><command>ul</command></term>
1133 <listitem>
1134 <para>A filter for translating underscores into escape sequences
1135 indicating underlining for the terminal in use</para>
1136 <indexterm zone="ch-system-util-linux ul">
1137 <primary sortas="b-ul">ul</primary>
1138 </indexterm>
1139 </listitem>
1140 </varlistentry>
1141
1142 <varlistentry id="umount">
1143 <term><command>umount</command></term>
1144 <listitem>
1145 <para>Disconnects a file system from the system's file tree</para>
1146 <indexterm zone="ch-system-util-linux umount">
1147 <primary sortas="b-umount">umount</primary>
1148 </indexterm>
1149 </listitem>
1150 </varlistentry>
1151
1152 <varlistentry id="uname26">
1153 <term><command>uname26</command></term>
1154 <listitem>
1155 <para>A symbolic link to setarch</para>
1156 <indexterm zone="ch-system-util-linux uname26">
1157 <primary sortas="b-uname26">uname26</primary>
1158 </indexterm>
1159 </listitem>
1160 </varlistentry>
1161
1162 <varlistentry id="unshare">
1163 <term><command>unshare</command></term>
1164 <listitem>
1165 <para>Runs a program with some namespaces unshared from parent</para>
1166 <indexterm zone="ch-system-util-linux unshare">
1167 <primary sortas="b-unshare">unshare</primary>
1168 </indexterm>
1169 </listitem>
1170 </varlistentry>
1171
1172 <varlistentry id="utmpdump">
1173 <term><command>utmpdump</command></term>
1174 <listitem>
1175 <para>Displays the content of the given login file in a more
1176 user-friendly format</para>
1177 <indexterm zone="ch-system-util-linux utmpdump">
1178 <primary sortas="b-utmpdump">utmpdump</primary>
1179 </indexterm>
1180 </listitem>
1181 </varlistentry>
1182
1183 <varlistentry id="uuidd">
1184 <term><command>uuidd</command></term>
1185 <listitem>
1186 <para>A daemon used by the UUID library to generate time-based
1187 UUIDs in a secure and guaranteed-unique fashion</para>
1188 <indexterm zone="ch-system-util-linux uuidd">
1189 <primary sortas="b-uuidd">uuidd</primary>
1190 </indexterm>
1191 </listitem>
1192 </varlistentry>
1193
1194 <varlistentry id="uuidgen">
1195 <term><command>uuidgen</command></term>
1196 <listitem>
1197 <para>Creates new UUIDs. Each new UUID can reasonably be considered
1198 unique among all UUIDs created, on the local system and on other
1199 systems, in the past and in the future</para>
1200 <indexterm zone="ch-system-util-linux uuidgen">
1201 <primary sortas="b-uuidgen">uuidgen</primary>
1202 </indexterm>
1203 </listitem>
1204 </varlistentry>
1205
1206 <varlistentry id="uuidparse">
1207 <term><command>uuidparse</command></term>
1208 <listitem>
1209 <para>An utility to parse unique identifiers</para>
1210 <indexterm zone="ch-system-util-linux uuidparse">
1211 <primary sortas="b-uuidparse">uuidparse</primary>
1212 </indexterm>
1213 </listitem>
1214 </varlistentry>
1215
1216 <varlistentry id="wall">
1217 <term><command>wall</command></term>
1218 <listitem>
1219 <para>Displays the contents of a file or, by default, its standard
1220 input, on the terminals of all currently logged in users</para>
1221 <indexterm zone="ch-system-util-linux wall">
1222 <primary sortas="b-wall">wall</primary>
1223 </indexterm>
1224 </listitem>
1225 </varlistentry>
1226
1227 <varlistentry id="wdctl">
1228 <term><command>wdctl</command></term>
1229 <listitem>
1230 <para>Shows hardware watchdog status</para>
1231 <indexterm zone="ch-system-util-linux wdctl">
1232 <primary sortas="b-wdctl">wdctl</primary>
1233 </indexterm>
1234 </listitem>
1235 </varlistentry>
1236
1237 <varlistentry id="whereis">
1238 <term><command>whereis</command></term>
1239 <listitem>
1240 <para>Reports the location of the binary, source, and man page
1241 for the given command</para>
1242 <indexterm zone="ch-system-util-linux whereis">
1243 <primary sortas="b-whereis">whereis</primary>
1244 </indexterm>
1245 </listitem>
1246 </varlistentry>
1247
1248 <varlistentry id="wipefs">
1249 <term><command>wipefs</command></term>
1250 <listitem>
1251 <para>Wipes a filesystem signature from a device</para>
1252 <indexterm zone="ch-system-util-linux wipefs">
1253 <primary sortas="b-wipefs">wipefs</primary>
1254 </indexterm>
1255 </listitem>
1256 </varlistentry>
1257
1258 <varlistentry id="x86_64">
1259 <term><command>x86_64</command></term>
1260 <listitem>
1261 <para>A symbolic link to setarch</para>
1262 <indexterm zone="ch-system-util-linux x86_64">
1263 <primary sortas="b-x86_64">x86_64</primary>
1264 </indexterm>
1265 </listitem>
1266 </varlistentry>
1267
1268 <varlistentry id="zramctl">
1269 <term><command>zramctl</command></term>
1270 <listitem>
1271 <para>A program to set up and control zram (compressed ram disk)
1272 devices</para>
1273 <indexterm zone="ch-system-util-linux zramctl">
1274 <primary sortas="b-zramctl">zramctl</primary>
1275 </indexterm>
1276 </listitem>
1277 </varlistentry>
1278
1279 <varlistentry id="libblkid">
1280 <term><filename class="libraryfile">libblkid</filename></term>
1281 <listitem>
1282 <para>Contains routines for device identification and token
1283 extraction</para>
1284 <indexterm zone="ch-system-util-linux libblkid">
1285 <primary sortas="c-libblkid">libblkid</primary>
1286 </indexterm>
1287 </listitem>
1288 </varlistentry>
1289
1290 <varlistentry id="libfdisk">
1291 <term><filename class="libraryfile">libfdisk</filename></term>
1292 <listitem>
1293 <para>Contains routines for manipulating partition tables</para>
1294 <indexterm zone="ch-system-util-linux libfdisk">
1295 <primary sortas="c-libfdisk">libfdisk</primary>
1296 </indexterm>
1297 </listitem>
1298 </varlistentry>
1299
1300 <varlistentry id="libmount">
1301 <term><filename class="libraryfile">libmount</filename></term>
1302 <listitem>
1303 <para>Contains routines for block device mounting and
1304 unmounting</para>
1305 <indexterm zone="ch-system-util-linux libmount">
1306 <primary sortas="c-libmount">libmount</primary>
1307 </indexterm>
1308 </listitem>
1309 </varlistentry>
1310
1311 <varlistentry id="libsmartcols">
1312 <term><filename class="libraryfile">libsmartcols</filename></term>
1313 <listitem>
1314 <para>Contains routines for aiding screen output in tabular form</para>
1315 <indexterm zone="ch-system-util-linux libsmartcols">
1316 <primary sortas="c-libsmartcols">libsmartcols</primary>
1317 </indexterm>
1318 </listitem>
1319 </varlistentry>
1320
1321 <varlistentry id="libuuid">
1322 <term><filename class="libraryfile">libuuid</filename></term>
1323 <listitem>
1324 <para>Contains routines for generating unique identifiers for objects
1325 that may be accessible beyond the local system</para>
1326 <indexterm zone="ch-system-util-linux libuuid">
1327 <primary sortas="c-libuuid">libuuid</primary>
1328 </indexterm>
1329 </listitem>
1330 </varlistentry>
1331
1332 </variablelist>
1333
1334 </sect2>
1335
1336</sect1>
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