source: BOOK/final-system/common/util-linux.xml@ 966f725

clfs-1.2 clfs-2.1 clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since 966f725 was e516f48, checked in by Jim Gifford <clfs@…>, 19 years ago

r2916@server (orig r1394): chris | 2006-04-17 01:08:22 -0700
Missed a couple references to the sun disklabel patches.

  • Property mode set to 100644
File size: 26.6 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
3 "http://www.oasis-open.org/docbook/xml/4.4/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 <title>Util-linux-&util-linux-version;</title>
12
13 <indexterm zone="ch-system-util-linux">
14 <primary sortas="a-Util-linux">Util-linux</primary>
15 </indexterm>
16
17 <sect2 role="package">
18 <title/>
19
20 <para>The Util-linux package contains miscellaneous utility programs.
21 Among them are utilities for handling file systems, consoles, partitions,
22 and messages.</para>
23
24 <segmentedlist>
25 <segtitle>&dependencies;</segtitle>
26
27 <seglistitem>
28 <seg>Bash, Binutils, Coreutils, Diffutils, E2fsprogs, GCC,
29 Gettext, Glibc, Grep, Make, Ncurses, Patch,
30 Sed, and Zlib</seg>
31 </seglistitem>
32 </segmentedlist>
33
34 </sect2>
35
36 <sect2 id="fhs-util-linux" role="installation">
37 <title>FHS compliance notes</title>
38
39 <para>The FHS recommends using the <filename
40 class="directory">/var/lib/hwclock</filename> directory instead of the
41 usual <filename class="directory">/etc</filename> directory as the
42 location for the <filename>adjtime</filename> file. To make the
43 <command>hwclock</command> program FHS-compliant, run the following:</para>
44
45<screen><userinput>sed -i 's@etc/adjtime@var/lib/hwclock/adjtime@g' \
46 hwclock/hwclock.c
47mkdir -pv /var/lib/hwclock</userinput></screen>
48
49 </sect2>
50
51 <sect2 role="installation">
52 <title>Installation of Util-linux</title>
53
54 <para os="p1">Util-linux fails to compile against newer versions of
55 Linux-Libc-Headers. The following patch properly fixes this issue:</para>
56
57<screen os="p2"><userinput>patch -Np1 -i ../&util-linux-cramfs-patch;</userinput></screen>
58
59 <para os="p3">The following patch fixes build issues with GCC &gcc-version;:</para>
60
61<screen os="p4"><userinput>patch -Np1 -i ../&util-linux-gcc4_fixes-patch;</userinput></screen>
62
63 <para os="p5">Util-linux does not compute the checksum of a sun disklabel
64 properly with gcc-&gcc-version;. The following patch fixes this issue:</para>
65
66<screen os="p6"><userinput>patch -Np1 -i ../&util-linux-gcc41_sun_disklabel_fixes-patch;</userinput></screen>
67
68 <para os="a">Prepare Util-linux for compilation:</para>
69
70<screen os="b"><userinput>./configure</userinput></screen>
71
72 <para os="c">Compile the package:</para>
73
74<screen os="d"><userinput>make HAVE_KILL=yes HAVE_SLN=yes</userinput></screen>
75
76 <variablelist os="e">
77 <title>The meaning of the make parameters:</title>
78
79 <varlistentry os="e1">
80 <term><parameter>HAVE_KILL=yes</parameter></term>
81 <listitem>
82 <para>This prevents the <command>kill</command> program (already
83 installed by Procps) from being built and installed again.</para>
84 </listitem>
85 </varlistentry>
86
87 <varlistentry os="e2">
88 <term><parameter>HAVE_SLN=yes</parameter></term>
89 <listitem>
90 <para>This prevents the <command>sln</command> program (a
91 statically linked version of <command>ln</command> already installed
92 by Glibc) from being built and installed again.</para>
93 </listitem>
94 </varlistentry>
95
96 </variablelist>
97
98 <para os="f">This package does not come with a test suite.</para>
99
100 <para os="g">Install the package and move the <command>logger</command> binary
101 to <filename class="directory">/bin</filename> as it is needed by the
102 LFS-Bootscripts package:</para>
103
104<screen os="h"><userinput>make HAVE_KILL=yes HAVE_SLN=yes install
105mv -v /usr/bin/logger /bin</userinput></screen>
106
107 </sect2>
108
109 <sect2 id="contents-util-linux" role="content">
110 <title>Contents of Util-linux</title>
111
112 <segmentedlist>
113 <segtitle>Installed programs</segtitle>
114
115 <seglistitem>
116 <seg>agetty, arch, blockdev, cal, cfdisk, chkdupexe, col, colcrt,
117 colrm, column, ctrlaltdel, cytune, ddate, dmesg, elvtune, fdformat,
118 fdisk, fsck.cramfs, fsck.minix, getopt, hexdump, hwclock, ipcrm,
119 ipcs, isosize, line, logger, look, losetup, mcookie, mkfs, mkfs.bfs,
120 mkfs.cramfs, mkfs.minix, mkswap, more, mount, namei, pg, pivot_root,
121 ramsize (link to rdev), raw, rdev, readprofile, rename, renice, rev,
122 rootflags (link to rdev), script, setfdprm, setsid, setterm, sfdisk,
123 swapdev, swapoff (link to swapon), swapon, tunelp, ul, umount, vidmode
124 (link to rdev), whereis, and write</seg>
125 </seglistitem>
126 </segmentedlist>
127
128 <variablelist>
129 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
130 <?dbfo list-presentation="list"?>
131 <?dbhtml list-presentation="table"?>
132
133 <varlistentry id="agetty">
134 <term><command>agetty</command></term>
135 <listitem>
136 <para>Opens a tty port, prompts for a login name,
137 and then invokes the <command>login</command> program</para>
138 <indexterm zone="ch-system-util-linux agetty">
139 <primary sortas="b-agetty">agetty</primary>
140 </indexterm>
141 </listitem>
142 </varlistentry>
143
144 <varlistentry id="arch">
145 <term><command>arch</command></term>
146 <listitem>
147 <para>Reports the machine's architecture</para>
148 <indexterm zone="ch-system-util-linux arch">
149 <primary sortas="b-arch">arch</primary>
150 </indexterm>
151 </listitem>
152 </varlistentry>
153
154 <varlistentry id="blockdev">
155 <term><command>blockdev</command></term>
156 <listitem>
157 <para>Allows users to call block device ioctls from the command
158 line</para>
159 <indexterm zone="ch-system-util-linux blockdev">
160 <primary sortas="b-blockdev">blockdev</primary>
161 </indexterm>
162 </listitem>
163 </varlistentry>
164
165 <varlistentry id="cal">
166 <term><command>cal</command></term>
167 <listitem>
168 <para>Displays a simple calendar</para>
169 <indexterm zone="ch-system-util-linux cal">
170 <primary sortas="b-cal">cal</primary>
171 </indexterm>
172 </listitem>
173 </varlistentry>
174
175 <varlistentry id="cfdisk">
176 <term><command>cfdisk</command></term>
177 <listitem>
178 <para>Manipulates the partition table of the given device</para>
179 <indexterm zone="ch-system-util-linux cfdisk">
180 <primary sortas="b-cfdisk">cfdisk</primary>
181 </indexterm>
182 </listitem>
183 </varlistentry>
184
185 <varlistentry id="chkdupexe">
186 <term><command>chkdupexe</command></term>
187 <listitem>
188 <para>Finds duplicate executables</para>
189 <indexterm zone="ch-system-util-linux chkdupexe">
190 <primary sortas="b-chkdupexe">chkdupexe</primary>
191 </indexterm>
192 </listitem>
193 </varlistentry>
194
195 <varlistentry id="col">
196 <term><command>col</command></term>
197 <listitem>
198 <para>Filters out reverse line feeds</para>
199 <indexterm zone="ch-system-util-linux col">
200 <primary sortas="b-col">col</primary>
201 </indexterm>
202 </listitem>
203 </varlistentry>
204
205 <varlistentry id="colcrt">
206 <term><command>colcrt</command></term>
207 <listitem>
208 <para>Filters <command>nroff</command> output for terminals
209 that lack some capabilities, such as overstriking and half-lines</para>
210 <indexterm zone="ch-system-util-linux colcrt">
211 <primary sortas="b-colcrt">colcrt</primary>
212 </indexterm>
213 </listitem>
214 </varlistentry>
215
216 <varlistentry id="colrm">
217 <term><command>colrm</command></term>
218 <listitem>
219 <para>Filters out the given columns</para>
220 <indexterm zone="ch-system-util-linux colrm">
221 <primary sortas="b-colrm">colrm</primary>
222 </indexterm>
223 </listitem>
224 </varlistentry>
225
226 <varlistentry id="column">
227 <term><command>column</command></term>
228 <listitem>
229 <para>Formats a given file into multiple columns</para>
230 <indexterm zone="ch-system-util-linux column">
231 <primary sortas="b-column">column</primary>
232 </indexterm>
233 </listitem>
234 </varlistentry>
235
236 <varlistentry id="ctrlaltdel">
237 <term><command>ctrlaltdel</command></term>
238 <listitem>
239 <para>Sets the function of the Ctrl+Alt+Del key combination to a
240 hard or a soft reset</para>
241 <indexterm zone="ch-system-util-linux ctrlaltdel">
242 <primary sortas="b-ctrlaltdel">ctrlaltdel</primary>
243 </indexterm>
244 </listitem>
245 </varlistentry>
246
247 <varlistentry id="cytune">
248 <term><command>cytune</command></term>
249 <listitem>
250 <para>Tunes the parameters of the serial line drivers for
251 Cyclades cards</para>
252 <indexterm zone="ch-system-util-linux cytune">
253 <primary sortas="b-cytune">cytune</primary>
254 </indexterm>
255 </listitem>
256 </varlistentry>
257
258 <varlistentry id="ddate">
259 <term><command>ddate</command></term>
260 <listitem>
261 <para>Gives the Discordian date or converts the given Gregorian date
262 to a Discordian one</para>
263 <indexterm zone="ch-system-util-linux ddate">
264 <primary sortas="b-ddate">ddate</primary>
265 </indexterm>
266 </listitem>
267 </varlistentry>
268
269 <varlistentry id="dmesg">
270 <term><command>dmesg</command></term>
271 <listitem>
272 <para>Dumps the kernel boot messages</para>
273 <indexterm zone="ch-system-util-linux dmesg">
274 <primary sortas="b-dmesg">dmesg</primary>
275 </indexterm>
276 </listitem>
277 </varlistentry>
278
279 <varlistentry id="elvtune">
280 <term><command>elvtune</command></term>
281 <listitem>
282 <para>Tunes the performance and interactivity of a block
283 device</para>
284 <indexterm zone="ch-system-util-linux elvtune">
285 <primary sortas="b-elvtune">elvtune</primary>
286 </indexterm>
287 </listitem>
288 </varlistentry>
289
290 <varlistentry id="fdformat">
291 <term><command>fdformat</command></term>
292 <listitem>
293 <para>Low-level formats a floppy disk</para>
294 <indexterm zone="ch-system-util-linux fdformat">
295 <primary sortas="b-fdformat">fdformat</primary>
296 </indexterm>
297 </listitem>
298 </varlistentry>
299
300 <varlistentry id="fdisk">
301 <term><command>fdisk</command></term>
302 <listitem>
303 <para>Manipulates the partition table of the given device</para>
304 <indexterm zone="ch-system-util-linux fdisk">
305 <primary sortas="b-fdisk">fdisk</primary>
306 </indexterm>
307 </listitem>
308 </varlistentry>
309
310 <varlistentry id="fsck.cramfs">
311 <term><command>fsck.cramfs</command></term>
312 <listitem>
313 <para>Performs a consistency check on the Cramfs file system on the
314 given device</para>
315 <indexterm zone="ch-system-util-linux fsck.cramfs">
316 <primary sortas="b-fsck.cramfs">fsck.cramfs</primary>
317 </indexterm>
318 </listitem>
319 </varlistentry>
320
321 <varlistentry id="fsck.minix">
322 <term><command>fsck.minix</command></term>
323 <listitem>
324 <para>Performs a consistency check on the Minix file system on the
325 given device</para>
326 <indexterm zone="ch-system-util-linux fsck.minix">
327 <primary sortas="b-fsck.minix">fsck.minix</primary>
328 </indexterm>
329 </listitem>
330 </varlistentry>
331
332 <varlistentry id="getopt">
333 <term><command>getopt</command></term>
334 <listitem>
335 <para>Parses options in the given command line</para>
336 <indexterm zone="ch-system-util-linux getopt">
337 <primary sortas="b-getopt">getopt</primary>
338 </indexterm>
339 </listitem>
340 </varlistentry>
341
342 <varlistentry id="hexdump">
343 <term><command>hexdump</command></term>
344 <listitem>
345 <para>Dumps the given file in hexadecimal or in another given
346 format</para>
347 <indexterm zone="ch-system-util-linux hexdump">
348 <primary sortas="b-hexdump">hexdump</primary>
349 </indexterm>
350 </listitem>
351 </varlistentry>
352
353 <varlistentry id="hwclock">
354 <term><command>hwclock</command></term>
355 <listitem>
356 <para>Reads or sets the system's hardware clock, also called
357 the Real-Time Clock (RTC) or Basic Input-Output System (BIOS)
358 clock</para>
359 <indexterm zone="ch-system-util-linux hwclock">
360 <primary sortas="b-hwclock">hwclock</primary>
361 </indexterm>
362 </listitem>
363 </varlistentry>
364
365 <varlistentry id="ipcrm">
366 <term><command>ipcrm</command></term>
367 <listitem>
368 <para>Removes the given Inter-Process Communication (IPC) resource</para>
369 <indexterm zone="ch-system-util-linux ipcrm">
370 <primary sortas="b-ipcrm">ipcrm</primary>
371 </indexterm>
372 </listitem>
373 </varlistentry>
374
375 <varlistentry id="ipcs">
376 <term><command>ipcs</command></term>
377 <listitem>
378 <para>Provides IPC status information</para>
379 <indexterm zone="ch-system-util-linux ipcs">
380 <primary sortas="b-ipcs">ipcs</primary>
381 </indexterm>
382 </listitem>
383 </varlistentry>
384
385 <varlistentry id="isosize">
386 <term><command>isosize</command></term>
387 <listitem>
388 <para>Reports the size of an iso9660 file system</para>
389 <indexterm zone="ch-system-util-linux isosize">
390 <primary sortas="b-isosize">isosize</primary>
391 </indexterm>
392 </listitem>
393 </varlistentry>
394
395 <varlistentry id="line">
396 <term><command>line</command></term>
397 <listitem>
398 <para>Copies a single line</para>
399 <indexterm zone="ch-system-util-linux line">
400 <primary sortas="b-line">line</primary>
401 </indexterm>
402 </listitem>
403 </varlistentry>
404
405 <varlistentry id="logger">
406 <term><command>logger</command></term>
407 <listitem>
408 <para>Enters the given message into the system log</para>
409 <indexterm zone="ch-system-util-linux logger">
410 <primary sortas="b-logger">logger</primary>
411 </indexterm>
412 </listitem>
413 </varlistentry>
414
415 <varlistentry id="look">
416 <term><command>look</command></term>
417 <listitem>
418 <para>Displays lines that begin with the given string</para>
419 <indexterm zone="ch-system-util-linux look">
420 <primary sortas="b-look">look</primary>
421 </indexterm>
422 </listitem>
423 </varlistentry>
424
425 <varlistentry id="losetup">
426 <term><command>losetup</command></term>
427 <listitem>
428 <para>Sets up and controls loop devices</para>
429 <indexterm zone="ch-system-util-linux losetup">
430 <primary sortas="b-losetup">losetup</primary>
431 </indexterm>
432 </listitem>
433 </varlistentry>
434
435 <varlistentry id="mcookie">
436 <term><command>mcookie</command></term>
437 <listitem>
438 <para>Generates magic cookies (128-bit random hexadecimal numbers) for
439 <command>xauth</command></para>
440 <indexterm zone="ch-system-util-linux mcookie">
441 <primary sortas="b-mcookie">mcookie</primary>
442 </indexterm>
443 </listitem>
444 </varlistentry>
445
446 <varlistentry id="mkfs">
447 <term><command>mkfs</command></term>
448 <listitem>
449 <para>Builds a file system on a device (usually a hard disk
450 partition)</para>
451 <indexterm zone="ch-system-util-linux mkfs">
452 <primary sortas="b-mkfs">mkfs</primary>
453 </indexterm>
454 </listitem>
455 </varlistentry>
456
457 <varlistentry id="mkfs.bfs">
458 <term><command>mkfs.bfs</command></term>
459 <listitem>
460 <para>Creates a Santa Cruz Operations (SCO) bfs file system</para>
461 <indexterm zone="ch-system-util-linux mkfs.bfs">
462 <primary sortas="b-mkfs.bfs">mkfs.bfs</primary>
463 </indexterm>
464 </listitem>
465 </varlistentry>
466
467 <varlistentry id="mkfs.cramfs">
468 <term><command>mkfs.cramfs</command></term>
469 <listitem>
470 <para>Creates a cramfs file system</para>
471 <indexterm zone="ch-system-util-linux mkfs.cramfs">
472 <primary sortas="b-mkfs.cramfs">mkfs.cramfs</primary>
473 </indexterm>
474 </listitem>
475 </varlistentry>
476
477 <varlistentry id="mkfs.minix">
478 <term><command>mkfs.minix</command></term>
479 <listitem>
480 <para>Creates a Minix file system</para>
481 <indexterm zone="ch-system-util-linux mkfs.minix">
482 <primary sortas="b-mkfs.minix">mkfs.minix</primary>
483 </indexterm>
484 </listitem>
485 </varlistentry>
486
487 <varlistentry id="mkswap">
488 <term><command>mkswap</command></term>
489 <listitem>
490 <para>Initializes the given device or file to be used as a swap
491 area</para>
492 <indexterm zone="ch-system-util-linux mkswap">
493 <primary sortas="b-mkswap">mkswap</primary>
494 </indexterm>
495 </listitem>
496 </varlistentry>
497
498 <varlistentry id="more">
499 <term><command>more</command></term>
500 <listitem>
501 <para>A filter for paging through text one screen at a time</para>
502 <indexterm zone="ch-system-util-linux more">
503 <primary sortas="b-more">more</primary>
504 </indexterm>
505 </listitem>
506 </varlistentry>
507
508 <varlistentry id="mount">
509 <term><command>mount</command></term>
510 <listitem>
511 <para>Attaches the file system on the given device to a specified
512 directory in the file-system tree</para>
513 <indexterm zone="ch-system-util-linux mount">
514 <primary sortas="b-mount">mount</primary>
515 </indexterm>
516 </listitem>
517 </varlistentry>
518
519 <varlistentry id="namei">
520 <term><command>namei</command></term>
521 <listitem>
522 <para>Shows the symbolic links in the given pathnames</para>
523 <indexterm zone="ch-system-util-linux namei">
524 <primary sortas="b-namei">namei</primary>
525 </indexterm>
526 </listitem>
527 </varlistentry>
528
529 <varlistentry id="pg">
530 <term><command>pg</command></term>
531 <listitem>
532 <para>Displays a text file one screen full at a time</para>
533 <indexterm zone="ch-system-util-linux pg">
534 <primary sortas="b-pg">pg</primary>
535 </indexterm>
536 </listitem>
537 </varlistentry>
538
539 <varlistentry id="pivot_root">
540 <term><command>pivot_root</command></term>
541 <listitem>
542 <para>Makes the given file system the new root file system of the
543 current process</para>
544 <indexterm zone="ch-system-util-linux pivot_root">
545 <primary sortas="b-pivot_root">pivot_root</primary>
546 </indexterm>
547 </listitem>
548 </varlistentry>
549
550 <varlistentry id="ramsize">
551 <term><command>ramsize</command></term>
552 <listitem>
553 <para>Sets the size of the RAM disk in a bootable image</para>
554 <indexterm zone="ch-system-util-linux ramsize">
555 <primary sortas="b-ramsize">ramsize</primary>
556 </indexterm>
557 </listitem>
558 </varlistentry>
559
560 <varlistentry id="raw">
561 <term><command>raw</command></term>
562 <listitem>
563 <para>Used to bind a Linux raw character device to a block
564 device</para>
565 <indexterm zone="ch-system-util-linux raw">
566 <primary sortas="b-raw">raw</primary>
567 </indexterm>
568 </listitem>
569 </varlistentry>
570
571 <varlistentry id="rdev">
572 <term><command>rdev</command></term>
573 <listitem>
574 <para>Queries and sets the root device, among other things, in a
575 bootable image</para>
576 <indexterm zone="ch-system-util-linux rdev">
577 <primary sortas="b-rdev">rdev</primary>
578 </indexterm>
579 </listitem>
580 </varlistentry>
581
582 <varlistentry id="readprofile">
583 <term><command>readprofile</command></term>
584 <listitem>
585 <para>Reads kernel profiling information</para>
586 <indexterm zone="ch-system-util-linux readprofile">
587 <primary sortas="b-readprofile">readprofile</primary>
588 </indexterm>
589 </listitem>
590 </varlistentry>
591
592 <varlistentry id="rename">
593 <term><command>rename</command></term>
594 <listitem>
595 <para>Renames the given files, replacing a given string with
596 another</para>
597 <indexterm zone="ch-system-util-linux rename">
598 <primary sortas="b-rename">rename</primary>
599 </indexterm>
600 </listitem>
601 </varlistentry>
602
603 <varlistentry id="renice">
604 <term><command>renice</command></term>
605 <listitem>
606 <para>Alters the priority of running processes</para>
607 <indexterm zone="ch-system-util-linux renice">
608 <primary sortas="b-renice">renice</primary>
609 </indexterm>
610 </listitem>
611 </varlistentry>
612
613 <varlistentry id="rev">
614 <term><command>rev</command></term>
615 <listitem>
616 <para>Reverses the lines of a given file</para>
617 <indexterm zone="ch-system-util-linux rev">
618 <primary sortas="b-rev">rev</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <varlistentry id="rootflags">
624 <term><command>rootflags</command></term>
625 <listitem>
626 <para>Sets the rootflags in a bootable image</para>
627 <indexterm zone="ch-system-util-linux rootflags">
628 <primary sortas="b-rootflags">rootflags</primary>
629 </indexterm>
630 </listitem>
631 </varlistentry>
632
633 <varlistentry id="script">
634 <term><command>script</command></term>
635 <listitem>
636 <para>Makes a typescript of a terminal session</para>
637 <indexterm zone="ch-system-util-linux script">
638 <primary sortas="b-script">script</primary>
639 </indexterm>
640 </listitem>
641 </varlistentry>
642
643 <varlistentry id="setfdprm">
644 <term><command>setfdprm</command></term>
645 <listitem>
646 <para>Sets user-provided floppy disk parameters</para>
647 <indexterm zone="ch-system-util-linux setfdprm">
648 <primary sortas="b-setfdprm">setfdprm</primary>
649 </indexterm>
650 </listitem>
651 </varlistentry>
652
653 <varlistentry id="setsid">
654 <term><command>setsid</command></term>
655 <listitem>
656 <para>Runs the given program in a new session</para>
657 <indexterm zone="ch-system-util-linux setsid">
658 <primary sortas="b-setsid">setsid</primary>
659 </indexterm>
660 </listitem>
661 </varlistentry>
662
663 <varlistentry id="setterm">
664 <term><command>setterm</command></term>
665 <listitem>
666 <para>Sets terminal attributes</para>
667 <indexterm zone="ch-system-util-linux setterm">
668 <primary sortas="b-setterm">setterm</primary>
669 </indexterm>
670 </listitem>
671 </varlistentry>
672
673 <varlistentry id="sfdisk">
674 <term><command>sfdisk</command></term>
675 <listitem>
676 <para>A disk partition table manipulator</para>
677 <indexterm zone="ch-system-util-linux sfdisk">
678 <primary sortas="b-sfdisk">sfdisk</primary>
679 </indexterm>
680 </listitem>
681 </varlistentry>
682
683 <varlistentry id="swapdev">
684 <term><command>swapdev</command></term>
685 <listitem>
686 <para>Sets the swap device in a bootable image</para>
687 <indexterm zone="ch-system-util-linux swapdev">
688 <primary sortas="b-swapdev">swapdev</primary>
689 </indexterm>
690 </listitem>
691 </varlistentry>
692
693 <varlistentry id="swapoff">
694 <term><command>swapoff</command></term>
695 <listitem>
696 <para>Disables devices and files for paging and swapping</para>
697 <indexterm zone="ch-system-util-linux swapoff">
698 <primary sortas="b-swapoff">swapoff</primary>
699 </indexterm>
700 </listitem>
701 </varlistentry>
702
703 <varlistentry id="swapon">
704 <term><command>swapon</command></term>
705 <listitem>
706 <para>Enables devices and files for paging and swapping and
707 lists the devices and files currently in use</para>
708 <indexterm zone="ch-system-util-linux swapon">
709 <primary sortas="b-swapon">swapon</primary>
710 </indexterm>
711 </listitem>
712 </varlistentry>
713
714 <varlistentry id="tunelp">
715 <term><command>tunelp</command></term>
716 <listitem>
717 <para>Tunes the parameters of the line printer</para>
718 <indexterm zone="ch-system-util-linux tunelp">
719 <primary sortas="b-tunelp">tunelp</primary>
720 </indexterm>
721 </listitem>
722 </varlistentry>
723
724 <varlistentry id="ul">
725 <term><command>ul</command></term>
726 <listitem>
727 <para>A filter for translating underscores into escape sequences
728 indicating underlining for the terminal in use</para>
729 <indexterm zone="ch-system-util-linux ul">
730 <primary sortas="b-ul">ul</primary>
731 </indexterm>
732 </listitem>
733 </varlistentry>
734
735 <varlistentry id="umount">
736 <term><command>umount</command></term>
737 <listitem>
738 <para>Disconnects a file system from the system's file tree</para>
739 <indexterm zone="ch-system-util-linux umount">
740 <primary sortas="b-umount">umount</primary>
741 </indexterm>
742 </listitem>
743 </varlistentry>
744
745 <varlistentry id="vidmode">
746 <term><command>vidmode</command></term>
747 <listitem>
748 <para>Sets the video mode in a bootable image</para>
749 <indexterm zone="ch-system-util-linux vidmode">
750 <primary sortas="b-vidmode">vidmode</primary>
751 </indexterm>
752 </listitem>
753 </varlistentry>
754
755 <varlistentry id="whereis">
756 <term><command>whereis</command></term>
757 <listitem>
758 <para>Reports the location of the binary, source, and man page
759 for the given command</para>
760 <indexterm zone="ch-system-util-linux whereis">
761 <primary sortas="b-whereis">whereis</primary>
762 </indexterm>
763 </listitem>
764 </varlistentry>
765
766 <varlistentry id="write">
767 <term><command>write</command></term>
768 <listitem>
769 <para>Sends a message to the given user <emphasis>if</emphasis> that
770 user has not disabled receipt of such messages</para>
771 <indexterm zone="ch-system-util-linux write">
772 <primary sortas="b-write">write</primary>
773 </indexterm>
774 </listitem>
775 </varlistentry>
776
777 </variablelist>
778
779 </sect2>
780
781</sect1>
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