source: chapter06/util-linux-ng.xml@ abcee47

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Last change on this file since abcee47 was 0b8bbee, checked in by Jeremy Huntwork <jhuntwork@…>, 16 years ago

Two minor textual improvments

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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-ng" role="wrap">
9 <?dbhtml filename="util-linux-ng.html"?>
10
11 <sect1info condition="script">
12 <productname>util-linux-ng</productname>
13 <productnumber>&util-linux-ng-version;</productnumber>
14 <address>&util-linux-ng-url;</address>
15 </sect1info>
16
17 <title>Util-linux-ng-&util-linux-ng-version;</title>
18
19 <indexterm zone="ch-system-util-linux-ng">
20 <primary sortas="a-Util-linux-ng">Util-linux-ng</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The Util-linux-ng 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-ng-ch6-sbu;</seg>
36 <seg>&util-linux-ng-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. To make the
49 <command>hwclock</command> program FHS-compliant, run the
50 following:</para>
51
52<screen><userinput remap="pre">sed -e 's@etc/adjtime@var/lib/hwclock/adjtime@g' \
53 -i $(grep -rl '/etc/adjtime' .)
54mkdir -pv /var/lib/hwclock</userinput></screen>
55
56 </sect2>
57
58 <sect2 role="installation">
59 <title>Installation of Util-linux-ng</title>
60
61<screen><userinput remap="configure">./configure</userinput></screen>
62
63 <para>Compile the package:</para>
64
65<screen><userinput remap="make">make</userinput></screen>
66
67 <para>Install the package:</para>
68
69<screen><userinput remap="install">make install</userinput></screen>
70
71 </sect2>
72
73 <sect2 id="contents-utillinux" role="content">
74 <title>Contents of Util-linux-ng</title>
75
76 <segmentedlist>
77 <segtitle>Installed programs</segtitle>
78
79 <seglistitem>
80 <seg>agetty, arch, blockdev, cal, cfdisk, chkdupexe, col, colcrt,
81 colrm, column, ctrlaltdel, cytune, ddate, dmesg, elvtune, fdformat,
82 fdisk, flock, fsck.cramfs, fsck.minix, getopt, hexdump, hwclock, ipcrm,
83 ipcs, isosize, line, logger, look, losetup, mcookie, mkfs, mkfs.bfs,
84 mkfs.cramfs, mkfs.minix, mkswap, more, mount, namei, pg, pivot_root,
85 ramsize (link to rdev), raw, rdev, readprofile, rename, renice, rev,
86 rootflags (link to rdev), script, setfdprm, setsid, setterm, sfdisk,
87 swapoff (link to swapon), swapon, tailf, tunelp, ul, umount,
88 vidmode (link to rdev), whereis, and write</seg>
89 </seglistitem>
90 </segmentedlist>
91
92 <variablelist>
93 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
94 <?dbfo list-presentation="list"?>
95 <?dbhtml list-presentation="table"?>
96
97 <varlistentry id="agetty">
98 <term><command>agetty</command></term>
99 <listitem>
100 <para>Opens a tty port, prompts for a login name,
101 and then invokes the <command>login</command> program</para>
102 <indexterm zone="ch-system-util-linux-ng agetty">
103 <primary sortas="b-agetty">agetty</primary>
104 </indexterm>
105 </listitem>
106 </varlistentry>
107
108 <varlistentry id="arch">
109 <term><command>arch</command></term>
110 <listitem>
111 <para>Reports the machine's architecture</para>
112 <indexterm zone="ch-system-util-linux-ng arch">
113 <primary sortas="b-arch">arch</primary>
114 </indexterm>
115 </listitem>
116 </varlistentry>
117
118 <varlistentry id="blockdev">
119 <term><command>blockdev</command></term>
120 <listitem>
121 <para>Allows users to call block device ioctls from the command
122 line</para>
123 <indexterm zone="ch-system-util-linux-ng blockdev">
124 <primary sortas="b-blockdev">blockdev</primary>
125 </indexterm>
126 </listitem>
127 </varlistentry>
128
129 <varlistentry id="cal">
130 <term><command>cal</command></term>
131 <listitem>
132 <para>Displays a simple calendar</para>
133 <indexterm zone="ch-system-util-linux-ng cal">
134 <primary sortas="b-cal">cal</primary>
135 </indexterm>
136 </listitem>
137 </varlistentry>
138
139 <varlistentry id="cfdisk">
140 <term><command>cfdisk</command></term>
141 <listitem>
142 <para>Manipulates the partition table of the given device</para>
143 <indexterm zone="ch-system-util-linux-ng cfdisk">
144 <primary sortas="b-cfdisk">cfdisk</primary>
145 </indexterm>
146 </listitem>
147 </varlistentry>
148
149 <varlistentry id="chkdupexe">
150 <term><command>chkdupexe</command></term>
151 <listitem>
152 <para>Finds duplicate executables</para>
153 <indexterm zone="ch-system-util-linux-ng chkdupexe">
154 <primary sortas="b-chkdupexe">chkdupexe</primary>
155 </indexterm>
156 </listitem>
157 </varlistentry>
158
159 <varlistentry id="col">
160 <term><command>col</command></term>
161 <listitem>
162 <para>Filters out reverse line feeds</para>
163 <indexterm zone="ch-system-util-linux-ng col">
164 <primary sortas="b-col">col</primary>
165 </indexterm>
166 </listitem>
167 </varlistentry>
168
169 <varlistentry id="colcrt">
170 <term><command>colcrt</command></term>
171 <listitem>
172 <para>Filters <command>nroff</command> output for terminals
173 that lack some capabilities, such as overstriking and half-lines</para>
174 <indexterm zone="ch-system-util-linux-ng colcrt">
175 <primary sortas="b-colcrt">colcrt</primary>
176 </indexterm>
177 </listitem>
178 </varlistentry>
179
180 <varlistentry id="colrm">
181 <term><command>colrm</command></term>
182 <listitem>
183 <para>Filters out the given columns</para>
184 <indexterm zone="ch-system-util-linux-ng colrm">
185 <primary sortas="b-colrm">colrm</primary>
186 </indexterm>
187 </listitem>
188 </varlistentry>
189
190 <varlistentry id="column">
191 <term><command>column</command></term>
192 <listitem>
193 <para>Formats a given file into multiple columns</para>
194 <indexterm zone="ch-system-util-linux-ng column">
195 <primary sortas="b-column">column</primary>
196 </indexterm>
197 </listitem>
198 </varlistentry>
199
200 <varlistentry id="ctrlaltdel">
201 <term><command>ctrlaltdel</command></term>
202 <listitem>
203 <para>Sets the function of the Ctrl+Alt+Del key combination to a
204 hard or a soft reset</para>
205 <indexterm zone="ch-system-util-linux-ng ctrlaltdel">
206 <primary sortas="b-ctrlaltdel">ctrlaltdel</primary>
207 </indexterm>
208 </listitem>
209 </varlistentry>
210
211 <varlistentry id="cytune">
212 <term><command>cytune</command></term>
213 <listitem>
214 <para>Tunes the parameters of the serial line drivers for
215 Cyclades cards</para>
216 <indexterm zone="ch-system-util-linux-ng cytune">
217 <primary sortas="b-cytune">cytune</primary>
218 </indexterm>
219 </listitem>
220 </varlistentry>
221
222 <varlistentry id="ddate">
223 <term><command>ddate</command></term>
224 <listitem>
225 <para>Gives the Discordian date or converts the given Gregorian date
226 to a Discordian one</para>
227 <indexterm zone="ch-system-util-linux-ng ddate">
228 <primary sortas="b-ddate">ddate</primary>
229 </indexterm>
230 </listitem>
231 </varlistentry>
232
233 <varlistentry id="dmesg">
234 <term><command>dmesg</command></term>
235 <listitem>
236 <para>Dumps the kernel boot messages</para>
237 <indexterm zone="ch-system-util-linux-ng dmesg">
238 <primary sortas="b-dmesg">dmesg</primary>
239 </indexterm>
240 </listitem>
241 </varlistentry>
242
243 <varlistentry id="elvtune">
244 <term><command>elvtune</command></term>
245 <listitem>
246 <para>Tunes the performance and interactivity of a block
247 device</para>
248 <indexterm zone="ch-system-util-linux-ng elvtune">
249 <primary sortas="b-elvtune">elvtune</primary>
250 </indexterm>
251 </listitem>
252 </varlistentry>
253
254 <varlistentry id="fdformat">
255 <term><command>fdformat</command></term>
256 <listitem>
257 <para>Low-level formats a floppy disk</para>
258 <indexterm zone="ch-system-util-linux-ng fdformat">
259 <primary sortas="b-fdformat">fdformat</primary>
260 </indexterm>
261 </listitem>
262 </varlistentry>
263
264 <varlistentry id="fdisk">
265 <term><command>fdisk</command></term>
266 <listitem>
267 <para>Manipulates the paritition table of the given device</para>
268 <indexterm zone="ch-system-util-linux-ng fdisk">
269 <primary sortas="b-fdisk">fdisk</primary>
270 </indexterm>
271 </listitem>
272 </varlistentry>
273
274 <varlistentry id="flock">
275 <term><command>flock</command></term>
276 <listitem>
277 <para>Acquires a file lock and then executes a command with the lock
278 held</para>
279 <indexterm zone="ch-system-util-linux-ng flock">
280 <primary sortas="b-flock">flock</primary>
281 </indexterm>
282 </listitem>
283 </varlistentry>
284
285 <varlistentry id="fsck.cramfs">
286 <term><command>fsck.cramfs</command></term>
287 <listitem>
288 <para>Performs a consistency check on the Cramfs file system on the
289 given device</para>
290 <indexterm zone="ch-system-util-linux-ng fsck.cramfs">
291 <primary sortas="b-fsck.cramfs">fsck.cramfs</primary>
292 </indexterm>
293 </listitem>
294 </varlistentry>
295
296 <varlistentry id="fsck.minix">
297 <term><command>fsck.minix</command></term>
298 <listitem>
299 <para>Performs a consistency check on the Minix file system on the
300 given device</para>
301 <indexterm zone="ch-system-util-linux-ng fsck.minix">
302 <primary sortas="b-fsck.minix">fsck.minix</primary>
303 </indexterm>
304 </listitem>
305 </varlistentry>
306
307 <varlistentry id="getopt">
308 <term><command>getopt</command></term>
309 <listitem>
310 <para>Parses options in the given command line</para>
311 <indexterm zone="ch-system-util-linux-ng getopt">
312 <primary sortas="b-getopt">getopt</primary>
313 </indexterm>
314 </listitem>
315 </varlistentry>
316
317 <varlistentry id="hexdump">
318 <term><command>hexdump</command></term>
319 <listitem>
320 <para>Dumps the given file in hexadecimal or in another given
321 format</para>
322 <indexterm zone="ch-system-util-linux-ng hexdump">
323 <primary sortas="b-hexdump">hexdump</primary>
324 </indexterm>
325 </listitem>
326 </varlistentry>
327
328 <varlistentry id="hwclock">
329 <term><command>hwclock</command></term>
330 <listitem>
331 <para>Reads or sets the system's hardware clock, also called
332 the Real-Time Clock (RTC) or Basic Input-Output System (BIOS)
333 clock</para>
334 <indexterm zone="ch-system-util-linux-ng hwclock">
335 <primary sortas="b-hwclock">hwclock</primary>
336 </indexterm>
337 </listitem>
338 </varlistentry>
339
340 <varlistentry id="ipcrm">
341 <term><command>ipcrm</command></term>
342 <listitem>
343 <para>Removes the given Inter-Process Communication (IPC) resource</para>
344 <indexterm zone="ch-system-util-linux-ng ipcrm">
345 <primary sortas="b-ipcrm">ipcrm</primary>
346 </indexterm>
347 </listitem>
348 </varlistentry>
349
350 <varlistentry id="ipcs">
351 <term><command>ipcs</command></term>
352 <listitem>
353 <para>Provides IPC status information</para>
354 <indexterm zone="ch-system-util-linux-ng ipcs">
355 <primary sortas="b-ipcs">ipcs</primary>
356 </indexterm>
357 </listitem>
358 </varlistentry>
359
360 <varlistentry id="isosize">
361 <term><command>isosize</command></term>
362 <listitem>
363 <para>Reports the size of an iso9660 file system</para>
364 <indexterm zone="ch-system-util-linux-ng isosize">
365 <primary sortas="b-isosize">isosize</primary>
366 </indexterm>
367 </listitem>
368 </varlistentry>
369
370 <varlistentry id="line">
371 <term><command>line</command></term>
372 <listitem>
373 <para>Copies a single line</para>
374 <indexterm zone="ch-system-util-linux-ng line">
375 <primary sortas="b-line">line</primary>
376 </indexterm>
377 </listitem>
378 </varlistentry>
379
380 <varlistentry id="logger">
381 <term><command>logger</command></term>
382 <listitem>
383 <para>Enters the given message into the system log</para>
384 <indexterm zone="ch-system-util-linux-ng logger">
385 <primary sortas="b-logger">logger</primary>
386 </indexterm>
387 </listitem>
388 </varlistentry>
389
390 <varlistentry id="look">
391 <term><command>look</command></term>
392 <listitem>
393 <para>Displays lines that begin with the given string</para>
394 <indexterm zone="ch-system-util-linux-ng look">
395 <primary sortas="b-look">look</primary>
396 </indexterm>
397 </listitem>
398 </varlistentry>
399
400 <varlistentry id="losetup">
401 <term><command>losetup</command></term>
402 <listitem>
403 <para>Sets up and controls loop devices</para>
404 <indexterm zone="ch-system-util-linux-ng losetup">
405 <primary sortas="b-losetup">losetup</primary>
406 </indexterm>
407 </listitem>
408 </varlistentry>
409
410 <varlistentry id="mcookie">
411 <term><command>mcookie</command></term>
412 <listitem>
413 <para>Generates magic cookies (128-bit random hexadecimal numbers) for
414 <command>xauth</command></para>
415 <indexterm zone="ch-system-util-linux-ng mcookie">
416 <primary sortas="b-mcookie">mcookie</primary>
417 </indexterm>
418 </listitem>
419 </varlistentry>
420
421 <varlistentry id="mkfs">
422 <term><command>mkfs</command></term>
423 <listitem>
424 <para>Builds a file system on a device (usually a hard disk
425 partition)</para>
426 <indexterm zone="ch-system-util-linux-ng mkfs">
427 <primary sortas="b-mkfs">mkfs</primary>
428 </indexterm>
429 </listitem>
430 </varlistentry>
431
432 <varlistentry id="mkfs.bfs">
433 <term><command>mkfs.bfs</command></term>
434 <listitem>
435 <para>Creates a Santa Cruz Operations (SCO) bfs file system</para>
436 <indexterm zone="ch-system-util-linux-ng mkfs.bfs">
437 <primary sortas="b-mkfs.bfs">mkfs.bfs</primary>
438 </indexterm>
439 </listitem>
440 </varlistentry>
441
442 <varlistentry id="mkfs.cramfs">
443 <term><command>mkfs.cramfs</command></term>
444 <listitem>
445 <para>Creates a cramfs file system</para>
446 <indexterm zone="ch-system-util-linux-ng mkfs.cramfs">
447 <primary sortas="b-mkfs.cramfs">mkfs.cramfs</primary>
448 </indexterm>
449 </listitem>
450 </varlistentry>
451
452 <varlistentry id="mkfs.minix">
453 <term><command>mkfs.minix</command></term>
454 <listitem>
455 <para>Creates a Minix file system</para>
456 <indexterm zone="ch-system-util-linux-ng mkfs.minix">
457 <primary sortas="b-mkfs.minix">mkfs.minix</primary>
458 </indexterm>
459 </listitem>
460 </varlistentry>
461
462 <varlistentry id="mkswap">
463 <term><command>mkswap</command></term>
464 <listitem>
465 <para>Initializes the given device or file to be used as a swap
466 area</para>
467 <indexterm zone="ch-system-util-linux-ng mkswap">
468 <primary sortas="b-mkswap">mkswap</primary>
469 </indexterm>
470 </listitem>
471 </varlistentry>
472
473 <varlistentry id="more">
474 <term><command>more</command></term>
475 <listitem>
476 <para>A filter for paging through text one screen at a time</para>
477 <indexterm zone="ch-system-util-linux-ng more">
478 <primary sortas="b-more">more</primary>
479 </indexterm>
480 </listitem>
481 </varlistentry>
482
483 <varlistentry id="mount">
484 <term><command>mount</command></term>
485 <listitem>
486 <para>Attaches the file system on the given device to a specified
487 directory in the file-system tree</para>
488 <indexterm zone="ch-system-util-linux-ng mount">
489 <primary sortas="b-mount">mount</primary>
490 </indexterm>
491 </listitem>
492 </varlistentry>
493
494 <varlistentry id="namei">
495 <term><command>namei</command></term>
496 <listitem>
497 <para>Shows the symbolic links in the given pathnames</para>
498 <indexterm zone="ch-system-util-linux-ng namei">
499 <primary sortas="b-namei">namei</primary>
500 </indexterm>
501 </listitem>
502 </varlistentry>
503
504 <varlistentry id="pg">
505 <term><command>pg</command></term>
506 <listitem>
507 <para>Displays a text file one screen full at a time</para>
508 <indexterm zone="ch-system-util-linux-ng pg">
509 <primary sortas="b-pg">pg</primary>
510 </indexterm>
511 </listitem>
512 </varlistentry>
513
514 <varlistentry id="pivot_root">
515 <term><command>pivot_root</command></term>
516 <listitem>
517 <para>Makes the given file system the new root file system of the
518 current process</para>
519 <indexterm zone="ch-system-util-linux-ng pivot_root">
520 <primary sortas="b-pivot_root">pivot_root</primary>
521 </indexterm>
522 </listitem>
523 </varlistentry>
524
525 <varlistentry id="ramsize">
526 <term><command>ramsize</command></term>
527 <listitem>
528 <para>Sets the size of the RAM disk in a bootable image</para>
529 <indexterm zone="ch-system-util-linux-ng ramsize">
530 <primary sortas="b-ramsize">ramsize</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="raw">
536 <term><command>raw</command></term>
537 <listitem>
538 <para>Used to bind a Linux raw character device to a block
539 device</para>
540 <indexterm zone="ch-system-util-linux-ng raw">
541 <primary sortas="b-raw">raw</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="rdev">
547 <term><command>rdev</command></term>
548 <listitem>
549 <para>Queries and sets the root device, among other things, in a
550 bootable image</para>
551 <indexterm zone="ch-system-util-linux-ng rdev">
552 <primary sortas="b-rdev">rdev</primary>
553 </indexterm>
554 </listitem>
555 </varlistentry>
556
557 <varlistentry id="readprofile">
558 <term><command>readprofile</command></term>
559 <listitem>
560 <para>Reads kernel profiling information</para>
561 <indexterm zone="ch-system-util-linux-ng readprofile">
562 <primary sortas="b-readprofile">readprofile</primary>
563 </indexterm>
564 </listitem>
565 </varlistentry>
566
567 <varlistentry id="rename">
568 <term><command>rename</command></term>
569 <listitem>
570 <para>Renames the given files, replacing a given string with
571 another</para>
572 <indexterm zone="ch-system-util-linux-ng rename">
573 <primary sortas="b-rename">rename</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="renice">
579 <term><command>renice</command></term>
580 <listitem>
581 <para>Alters the priority of running processes</para>
582 <indexterm zone="ch-system-util-linux-ng renice">
583 <primary sortas="b-renice">renice</primary>
584 </indexterm>
585 </listitem>
586 </varlistentry>
587
588 <varlistentry id="rev">
589 <term><command>rev</command></term>
590 <listitem>
591 <para>Reverses the lines of a given file</para>
592 <indexterm zone="ch-system-util-linux-ng rev">
593 <primary sortas="b-rev">rev</primary>
594 </indexterm>
595 </listitem>
596 </varlistentry>
597
598 <varlistentry id="rootflags">
599 <term><command>rootflags</command></term>
600 <listitem>
601 <para>Sets the rootflags in a bootable image</para>
602 <indexterm zone="ch-system-util-linux-ng rootflags">
603 <primary sortas="b-rootflags">rootflags</primary>
604 </indexterm>
605 </listitem>
606 </varlistentry>
607
608 <varlistentry id="script">
609 <term><command>script</command></term>
610 <listitem>
611 <para>Makes a typescript of a terminal session</para>
612 <indexterm zone="ch-system-util-linux-ng script">
613 <primary sortas="b-script">script</primary>
614 </indexterm>
615 </listitem>
616 </varlistentry>
617
618 <varlistentry id="setfdprm">
619 <term><command>setfdprm</command></term>
620 <listitem>
621 <para>Sets user-provided floppy disk parameters</para>
622 <indexterm zone="ch-system-util-linux-ng setfdprm">
623 <primary sortas="b-setfdprm">setfdprm</primary>
624 </indexterm>
625 </listitem>
626 </varlistentry>
627
628 <varlistentry id="setsid">
629 <term><command>setsid</command></term>
630 <listitem>
631 <para>Runs the given program in a new session</para>
632 <indexterm zone="ch-system-util-linux-ng setsid">
633 <primary sortas="b-setsid">setsid</primary>
634 </indexterm>
635 </listitem>
636 </varlistentry>
637
638 <varlistentry id="setterm">
639 <term><command>setterm</command></term>
640 <listitem>
641 <para>Sets terminal attributes</para>
642 <indexterm zone="ch-system-util-linux-ng setterm">
643 <primary sortas="b-setterm">setterm</primary>
644 </indexterm>
645 </listitem>
646 </varlistentry>
647
648 <varlistentry id="sfdisk">
649 <term><command>sfdisk</command></term>
650 <listitem>
651 <para>A disk partition table manipulator</para>
652 <indexterm zone="ch-system-util-linux-ng sfdisk">
653 <primary sortas="b-sfdisk">sfdisk</primary>
654 </indexterm>
655 </listitem>
656 </varlistentry>
657
658 <varlistentry id="swapoff">
659 <term><command>swapoff</command></term>
660 <listitem>
661 <para>Disables devices and files for paging and swapping</para>
662 <indexterm zone="ch-system-util-linux-ng swapoff">
663 <primary sortas="b-swapoff">swapoff</primary>
664 </indexterm>
665 </listitem>
666 </varlistentry>
667
668 <varlistentry id="swapon">
669 <term><command>swapon</command></term>
670 <listitem>
671 <para>Enables devices and files for paging and swapping and
672 lists the devices and files currently in use</para>
673 <indexterm zone="ch-system-util-linux-ng swapon">
674 <primary sortas="b-swapon">swapon</primary>
675 </indexterm>
676 </listitem>
677 </varlistentry>
678
679 <varlistentry id="tailf">
680 <term><command>tailf</command></term>
681 <listitem>
682 <para>Tracks the growth of a log file. Displays the last 10 lines
683 of a log file, then continues displaying any new entries in the
684 log file as they are created</para>
685 <indexterm zone="ch-system-util-linux-ng tailf">
686 <primary sortas="b-tailf">tailf</primary>
687 </indexterm>
688 </listitem>
689 </varlistentry>
690
691 <varlistentry id="tunelp">
692 <term><command>tunelp</command></term>
693 <listitem>
694 <para>Tunes the parameters of the line printer</para>
695 <indexterm zone="ch-system-util-linux-ng tunelp">
696 <primary sortas="b-tunelp">tunelp</primary>
697 </indexterm>
698 </listitem>
699 </varlistentry>
700
701 <varlistentry id="ul">
702 <term><command>ul</command></term>
703 <listitem>
704 <para>A filter for translating underscores into escape sequences
705 indicating underlining for the terminal in use</para>
706 <indexterm zone="ch-system-util-linux-ng ul">
707 <primary sortas="b-ul">ul</primary>
708 </indexterm>
709 </listitem>
710 </varlistentry>
711
712 <varlistentry id="umount">
713 <term><command>umount</command></term>
714 <listitem>
715 <para>Disconnects a file system from the system's file tree</para>
716 <indexterm zone="ch-system-util-linux-ng umount">
717 <primary sortas="b-umount">umount</primary>
718 </indexterm>
719 </listitem>
720 </varlistentry>
721
722 <varlistentry id="vidmode">
723 <term><command>vidmode</command></term>
724 <listitem>
725 <para>Sets the video mode in a bootable image</para>
726 <indexterm zone="ch-system-util-linux-ng vidmode">
727 <primary sortas="b-vidmode">vidmode</primary>
728 </indexterm>
729 </listitem>
730 </varlistentry>
731
732 <varlistentry id="whereis">
733 <term><command>whereis</command></term>
734 <listitem>
735 <para>Reports the location of the binary, source, and man page
736 for the given command</para>
737 <indexterm zone="ch-system-util-linux-ng whereis">
738 <primary sortas="b-whereis">whereis</primary>
739 </indexterm>
740 </listitem>
741 </varlistentry>
742
743 <varlistentry id="write">
744 <term><command>write</command></term>
745 <listitem>
746 <para>Sends a message to the given user <emphasis>if</emphasis> that
747 user has not disabled receipt of such messages</para>
748 <indexterm zone="ch-system-util-linux-ng write">
749 <primary sortas="b-write">write</primary>
750 </indexterm>
751 </listitem>
752 </varlistentry>
753
754 </variablelist>
755
756 </sect2>
757
758</sect1>
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