source: BOOK/final-system/common/util-linux.xml@ 6f890b7

clfs-1.2 clfs-2.1 clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since 6f890b7 was e1153ea, checked in by Jim Gifford <clfs@…>, 19 years ago

r3371@server (orig r1554): chris | 2006-05-10 14:03:44 -0700
Removed dependency info from individual package instructions

  • Property mode set to 100644
File size: 26.1 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
25 </sect2>
26
27 <sect2 id="fhs-util-linux" role="installation">
28 <title>FHS compliance notes</title>
29
30 <para>The FHS recommends using the <filename
31 class="directory">/var/lib/hwclock</filename> directory instead of the
32 usual <filename class="directory">/etc</filename> directory as the
33 location for the <filename>adjtime</filename> file. To make the
34 <command>hwclock</command> program FHS-compliant, run the following:</para>
35
36<screen><userinput>sed -i 's@etc/adjtime@var/lib/hwclock/adjtime@g' \
37 hwclock/hwclock.c
38mkdir -pv /var/lib/hwclock</userinput></screen>
39
40 </sect2>
41
42 <sect2 role="installation">
43 <title>Installation of Util-linux</title>
44
45 <para os="p1">Util-linux fails to compile against newer versions of
46 Linux kernel headers. The following patch properly fixes this issue:</para>
47
48<screen os="p2"><userinput>patch -Np1 -i ../&util-linux-cramfs-patch;</userinput></screen>
49
50 <para os="p3">The following patch fixes build issues with GCC &gcc-version;:</para>
51
52<screen os="p4"><userinput>patch -Np1 -i ../&util-linux-gcc4_fixes-patch;</userinput></screen>
53
54 <para os="a">Prepare Util-linux for compilation:</para>
55
56<screen os="b"><userinput>./configure</userinput></screen>
57
58 <para os="c">Compile the package:</para>
59
60<screen os="d"><userinput>make HAVE_KILL=yes HAVE_SLN=yes</userinput></screen>
61
62 <variablelist os="e">
63 <title>The meaning of the make parameters:</title>
64
65 <varlistentry os="e1">
66 <term><parameter>HAVE_KILL=yes</parameter></term>
67 <listitem>
68 <para>This prevents the <command>kill</command> program (already
69 installed by Procps) from being built and installed again.</para>
70 </listitem>
71 </varlistentry>
72
73 <varlistentry os="e2">
74 <term><parameter>HAVE_SLN=yes</parameter></term>
75 <listitem>
76 <para>This prevents the <command>sln</command> program (a
77 statically linked version of <command>ln</command> already installed
78 by Glibc) from being built and installed again.</para>
79 </listitem>
80 </varlistentry>
81
82 </variablelist>
83
84 <para os="f">This package does not come with a test suite.</para>
85
86 <para os="g">Install the package and move the <command>logger</command> binary
87 to <filename class="directory">/bin</filename> as it is needed by the
88 LFS-Bootscripts package:</para>
89
90<screen os="h"><userinput>make HAVE_KILL=yes HAVE_SLN=yes install
91mv -v /usr/bin/logger /bin</userinput></screen>
92
93 </sect2>
94
95 <sect2 id="contents-util-linux" role="content">
96 <title>Contents of Util-linux</title>
97
98 <segmentedlist>
99 <segtitle>Installed programs</segtitle>
100
101 <seglistitem>
102 <seg>agetty, arch, blockdev, cal, cfdisk, chkdupexe, col, colcrt,
103 colrm, column, ctrlaltdel, cytune, ddate, dmesg, elvtune, fdformat,
104 fdisk, fsck.cramfs, fsck.minix, getopt, hexdump, hwclock, ipcrm,
105 ipcs, isosize, line, logger, look, losetup, mcookie, mkfs, mkfs.bfs,
106 mkfs.cramfs, mkfs.minix, mkswap, more, mount, namei, pg, pivot_root,
107 ramsize (link to rdev), raw, rdev, readprofile, rename, renice, rev,
108 rootflags (link to rdev), script, setfdprm, setsid, setterm, sfdisk,
109 swapdev, swapoff (link to swapon), swapon, tunelp, ul, umount, vidmode
110 (link to rdev), whereis, and write</seg>
111 </seglistitem>
112 </segmentedlist>
113
114 <variablelist>
115 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
116 <?dbfo list-presentation="list"?>
117 <?dbhtml list-presentation="table"?>
118
119 <varlistentry id="agetty">
120 <term><command>agetty</command></term>
121 <listitem>
122 <para>Opens a tty port, prompts for a login name,
123 and then invokes the <command>login</command> program</para>
124 <indexterm zone="ch-system-util-linux agetty">
125 <primary sortas="b-agetty">agetty</primary>
126 </indexterm>
127 </listitem>
128 </varlistentry>
129
130 <varlistentry id="arch">
131 <term><command>arch</command></term>
132 <listitem>
133 <para>Reports the machine's architecture</para>
134 <indexterm zone="ch-system-util-linux arch">
135 <primary sortas="b-arch">arch</primary>
136 </indexterm>
137 </listitem>
138 </varlistentry>
139
140 <varlistentry id="blockdev">
141 <term><command>blockdev</command></term>
142 <listitem>
143 <para>Allows users to call block device ioctls from the command
144 line</para>
145 <indexterm zone="ch-system-util-linux blockdev">
146 <primary sortas="b-blockdev">blockdev</primary>
147 </indexterm>
148 </listitem>
149 </varlistentry>
150
151 <varlistentry id="cal">
152 <term><command>cal</command></term>
153 <listitem>
154 <para>Displays a simple calendar</para>
155 <indexterm zone="ch-system-util-linux cal">
156 <primary sortas="b-cal">cal</primary>
157 </indexterm>
158 </listitem>
159 </varlistentry>
160
161 <varlistentry id="cfdisk">
162 <term><command>cfdisk</command></term>
163 <listitem>
164 <para>Manipulates the partition table of the given device</para>
165 <indexterm zone="ch-system-util-linux cfdisk">
166 <primary sortas="b-cfdisk">cfdisk</primary>
167 </indexterm>
168 </listitem>
169 </varlistentry>
170
171 <varlistentry id="chkdupexe">
172 <term><command>chkdupexe</command></term>
173 <listitem>
174 <para>Finds duplicate executables</para>
175 <indexterm zone="ch-system-util-linux chkdupexe">
176 <primary sortas="b-chkdupexe">chkdupexe</primary>
177 </indexterm>
178 </listitem>
179 </varlistentry>
180
181 <varlistentry id="col">
182 <term><command>col</command></term>
183 <listitem>
184 <para>Filters out reverse line feeds</para>
185 <indexterm zone="ch-system-util-linux col">
186 <primary sortas="b-col">col</primary>
187 </indexterm>
188 </listitem>
189 </varlistentry>
190
191 <varlistentry id="colcrt">
192 <term><command>colcrt</command></term>
193 <listitem>
194 <para>Filters <command>nroff</command> output for terminals
195 that lack some capabilities, such as overstriking and half-lines</para>
196 <indexterm zone="ch-system-util-linux colcrt">
197 <primary sortas="b-colcrt">colcrt</primary>
198 </indexterm>
199 </listitem>
200 </varlistentry>
201
202 <varlistentry id="colrm">
203 <term><command>colrm</command></term>
204 <listitem>
205 <para>Filters out the given columns</para>
206 <indexterm zone="ch-system-util-linux colrm">
207 <primary sortas="b-colrm">colrm</primary>
208 </indexterm>
209 </listitem>
210 </varlistentry>
211
212 <varlistentry id="column">
213 <term><command>column</command></term>
214 <listitem>
215 <para>Formats a given file into multiple columns</para>
216 <indexterm zone="ch-system-util-linux column">
217 <primary sortas="b-column">column</primary>
218 </indexterm>
219 </listitem>
220 </varlistentry>
221
222 <varlistentry id="ctrlaltdel">
223 <term><command>ctrlaltdel</command></term>
224 <listitem>
225 <para>Sets the function of the Ctrl+Alt+Del key combination to a
226 hard or a soft reset</para>
227 <indexterm zone="ch-system-util-linux ctrlaltdel">
228 <primary sortas="b-ctrlaltdel">ctrlaltdel</primary>
229 </indexterm>
230 </listitem>
231 </varlistentry>
232
233 <varlistentry id="cytune">
234 <term><command>cytune</command></term>
235 <listitem>
236 <para>Tunes the parameters of the serial line drivers for
237 Cyclades cards</para>
238 <indexterm zone="ch-system-util-linux cytune">
239 <primary sortas="b-cytune">cytune</primary>
240 </indexterm>
241 </listitem>
242 </varlistentry>
243
244 <varlistentry id="ddate">
245 <term><command>ddate</command></term>
246 <listitem>
247 <para>Gives the Discordian date or converts the given Gregorian date
248 to a Discordian one</para>
249 <indexterm zone="ch-system-util-linux ddate">
250 <primary sortas="b-ddate">ddate</primary>
251 </indexterm>
252 </listitem>
253 </varlistentry>
254
255 <varlistentry id="dmesg">
256 <term><command>dmesg</command></term>
257 <listitem>
258 <para>Dumps the kernel boot messages</para>
259 <indexterm zone="ch-system-util-linux dmesg">
260 <primary sortas="b-dmesg">dmesg</primary>
261 </indexterm>
262 </listitem>
263 </varlistentry>
264
265 <varlistentry id="elvtune">
266 <term><command>elvtune</command></term>
267 <listitem>
268 <para>Tunes the performance and interactivity of a block
269 device</para>
270 <indexterm zone="ch-system-util-linux elvtune">
271 <primary sortas="b-elvtune">elvtune</primary>
272 </indexterm>
273 </listitem>
274 </varlistentry>
275
276 <varlistentry id="fdformat">
277 <term><command>fdformat</command></term>
278 <listitem>
279 <para>Low-level formats a floppy disk</para>
280 <indexterm zone="ch-system-util-linux fdformat">
281 <primary sortas="b-fdformat">fdformat</primary>
282 </indexterm>
283 </listitem>
284 </varlistentry>
285
286 <varlistentry id="fdisk">
287 <term><command>fdisk</command></term>
288 <listitem>
289 <para>Manipulates the partition table of the given device</para>
290 <indexterm zone="ch-system-util-linux fdisk">
291 <primary sortas="b-fdisk">fdisk</primary>
292 </indexterm>
293 </listitem>
294 </varlistentry>
295
296 <varlistentry id="fsck.cramfs">
297 <term><command>fsck.cramfs</command></term>
298 <listitem>
299 <para>Performs a consistency check on the Cramfs file system on the
300 given device</para>
301 <indexterm zone="ch-system-util-linux fsck.cramfs">
302 <primary sortas="b-fsck.cramfs">fsck.cramfs</primary>
303 </indexterm>
304 </listitem>
305 </varlistentry>
306
307 <varlistentry id="fsck.minix">
308 <term><command>fsck.minix</command></term>
309 <listitem>
310 <para>Performs a consistency check on the Minix file system on the
311 given device</para>
312 <indexterm zone="ch-system-util-linux fsck.minix">
313 <primary sortas="b-fsck.minix">fsck.minix</primary>
314 </indexterm>
315 </listitem>
316 </varlistentry>
317
318 <varlistentry id="getopt">
319 <term><command>getopt</command></term>
320 <listitem>
321 <para>Parses options in the given command line</para>
322 <indexterm zone="ch-system-util-linux getopt">
323 <primary sortas="b-getopt">getopt</primary>
324 </indexterm>
325 </listitem>
326 </varlistentry>
327
328 <varlistentry id="hexdump">
329 <term><command>hexdump</command></term>
330 <listitem>
331 <para>Dumps the given file in hexadecimal or in another given
332 format</para>
333 <indexterm zone="ch-system-util-linux hexdump">
334 <primary sortas="b-hexdump">hexdump</primary>
335 </indexterm>
336 </listitem>
337 </varlistentry>
338
339 <varlistentry id="hwclock">
340 <term><command>hwclock</command></term>
341 <listitem>
342 <para>Reads or sets the system's hardware clock, also called
343 the Real-Time Clock (RTC) or Basic Input-Output System (BIOS)
344 clock</para>
345 <indexterm zone="ch-system-util-linux hwclock">
346 <primary sortas="b-hwclock">hwclock</primary>
347 </indexterm>
348 </listitem>
349 </varlistentry>
350
351 <varlistentry id="ipcrm">
352 <term><command>ipcrm</command></term>
353 <listitem>
354 <para>Removes the given Inter-Process Communication (IPC) resource</para>
355 <indexterm zone="ch-system-util-linux ipcrm">
356 <primary sortas="b-ipcrm">ipcrm</primary>
357 </indexterm>
358 </listitem>
359 </varlistentry>
360
361 <varlistentry id="ipcs">
362 <term><command>ipcs</command></term>
363 <listitem>
364 <para>Provides IPC status information</para>
365 <indexterm zone="ch-system-util-linux ipcs">
366 <primary sortas="b-ipcs">ipcs</primary>
367 </indexterm>
368 </listitem>
369 </varlistentry>
370
371 <varlistentry id="isosize">
372 <term><command>isosize</command></term>
373 <listitem>
374 <para>Reports the size of an iso9660 file system</para>
375 <indexterm zone="ch-system-util-linux isosize">
376 <primary sortas="b-isosize">isosize</primary>
377 </indexterm>
378 </listitem>
379 </varlistentry>
380
381 <varlistentry id="line">
382 <term><command>line</command></term>
383 <listitem>
384 <para>Copies a single line</para>
385 <indexterm zone="ch-system-util-linux line">
386 <primary sortas="b-line">line</primary>
387 </indexterm>
388 </listitem>
389 </varlistentry>
390
391 <varlistentry id="logger">
392 <term><command>logger</command></term>
393 <listitem>
394 <para>Enters the given message into the system log</para>
395 <indexterm zone="ch-system-util-linux logger">
396 <primary sortas="b-logger">logger</primary>
397 </indexterm>
398 </listitem>
399 </varlistentry>
400
401 <varlistentry id="look">
402 <term><command>look</command></term>
403 <listitem>
404 <para>Displays lines that begin with the given string</para>
405 <indexterm zone="ch-system-util-linux look">
406 <primary sortas="b-look">look</primary>
407 </indexterm>
408 </listitem>
409 </varlistentry>
410
411 <varlistentry id="losetup">
412 <term><command>losetup</command></term>
413 <listitem>
414 <para>Sets up and controls loop devices</para>
415 <indexterm zone="ch-system-util-linux losetup">
416 <primary sortas="b-losetup">losetup</primary>
417 </indexterm>
418 </listitem>
419 </varlistentry>
420
421 <varlistentry id="mcookie">
422 <term><command>mcookie</command></term>
423 <listitem>
424 <para>Generates magic cookies (128-bit random hexadecimal numbers) for
425 <command>xauth</command></para>
426 <indexterm zone="ch-system-util-linux mcookie">
427 <primary sortas="b-mcookie">mcookie</primary>
428 </indexterm>
429 </listitem>
430 </varlistentry>
431
432 <varlistentry id="mkfs">
433 <term><command>mkfs</command></term>
434 <listitem>
435 <para>Builds a file system on a device (usually a hard disk
436 partition)</para>
437 <indexterm zone="ch-system-util-linux mkfs">
438 <primary sortas="b-mkfs">mkfs</primary>
439 </indexterm>
440 </listitem>
441 </varlistentry>
442
443 <varlistentry id="mkfs.bfs">
444 <term><command>mkfs.bfs</command></term>
445 <listitem>
446 <para>Creates a Santa Cruz Operations (SCO) bfs file system</para>
447 <indexterm zone="ch-system-util-linux mkfs.bfs">
448 <primary sortas="b-mkfs.bfs">mkfs.bfs</primary>
449 </indexterm>
450 </listitem>
451 </varlistentry>
452
453 <varlistentry id="mkfs.cramfs">
454 <term><command>mkfs.cramfs</command></term>
455 <listitem>
456 <para>Creates a cramfs file system</para>
457 <indexterm zone="ch-system-util-linux mkfs.cramfs">
458 <primary sortas="b-mkfs.cramfs">mkfs.cramfs</primary>
459 </indexterm>
460 </listitem>
461 </varlistentry>
462
463 <varlistentry id="mkfs.minix">
464 <term><command>mkfs.minix</command></term>
465 <listitem>
466 <para>Creates a Minix file system</para>
467 <indexterm zone="ch-system-util-linux mkfs.minix">
468 <primary sortas="b-mkfs.minix">mkfs.minix</primary>
469 </indexterm>
470 </listitem>
471 </varlistentry>
472
473 <varlistentry id="mkswap">
474 <term><command>mkswap</command></term>
475 <listitem>
476 <para>Initializes the given device or file to be used as a swap
477 area</para>
478 <indexterm zone="ch-system-util-linux mkswap">
479 <primary sortas="b-mkswap">mkswap</primary>
480 </indexterm>
481 </listitem>
482 </varlistentry>
483
484 <varlistentry id="more">
485 <term><command>more</command></term>
486 <listitem>
487 <para>A filter for paging through text one screen at a time</para>
488 <indexterm zone="ch-system-util-linux more">
489 <primary sortas="b-more">more</primary>
490 </indexterm>
491 </listitem>
492 </varlistentry>
493
494 <varlistentry id="mount">
495 <term><command>mount</command></term>
496 <listitem>
497 <para>Attaches the file system on the given device to a specified
498 directory in the file-system tree</para>
499 <indexterm zone="ch-system-util-linux mount">
500 <primary sortas="b-mount">mount</primary>
501 </indexterm>
502 </listitem>
503 </varlistentry>
504
505 <varlistentry id="namei">
506 <term><command>namei</command></term>
507 <listitem>
508 <para>Shows the symbolic links in the given pathnames</para>
509 <indexterm zone="ch-system-util-linux namei">
510 <primary sortas="b-namei">namei</primary>
511 </indexterm>
512 </listitem>
513 </varlistentry>
514
515 <varlistentry id="pg">
516 <term><command>pg</command></term>
517 <listitem>
518 <para>Displays a text file one screen full at a time</para>
519 <indexterm zone="ch-system-util-linux pg">
520 <primary sortas="b-pg">pg</primary>
521 </indexterm>
522 </listitem>
523 </varlistentry>
524
525 <varlistentry id="pivot_root">
526 <term><command>pivot_root</command></term>
527 <listitem>
528 <para>Makes the given file system the new root file system of the
529 current process</para>
530 <indexterm zone="ch-system-util-linux pivot_root">
531 <primary sortas="b-pivot_root">pivot_root</primary>
532 </indexterm>
533 </listitem>
534 </varlistentry>
535
536 <varlistentry id="ramsize">
537 <term><command>ramsize</command></term>
538 <listitem>
539 <para>Sets the size of the RAM disk in a bootable image</para>
540 <indexterm zone="ch-system-util-linux ramsize">
541 <primary sortas="b-ramsize">ramsize</primary>
542 </indexterm>
543 </listitem>
544 </varlistentry>
545
546 <varlistentry id="raw">
547 <term><command>raw</command></term>
548 <listitem>
549 <para>Used to bind a Linux raw character device to a block
550 device</para>
551 <indexterm zone="ch-system-util-linux raw">
552 <primary sortas="b-raw">raw</primary>
553 </indexterm>
554 </listitem>
555 </varlistentry>
556
557 <varlistentry id="rdev">
558 <term><command>rdev</command></term>
559 <listitem>
560 <para>Queries and sets the root device, among other things, in a
561 bootable image</para>
562 <indexterm zone="ch-system-util-linux rdev">
563 <primary sortas="b-rdev">rdev</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="readprofile">
569 <term><command>readprofile</command></term>
570 <listitem>
571 <para>Reads kernel profiling information</para>
572 <indexterm zone="ch-system-util-linux readprofile">
573 <primary sortas="b-readprofile">readprofile</primary>
574 </indexterm>
575 </listitem>
576 </varlistentry>
577
578 <varlistentry id="rename">
579 <term><command>rename</command></term>
580 <listitem>
581 <para>Renames the given files, replacing a given string with
582 another</para>
583 <indexterm zone="ch-system-util-linux rename">
584 <primary sortas="b-rename">rename</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="renice">
590 <term><command>renice</command></term>
591 <listitem>
592 <para>Alters the priority of running processes</para>
593 <indexterm zone="ch-system-util-linux renice">
594 <primary sortas="b-renice">renice</primary>
595 </indexterm>
596 </listitem>
597 </varlistentry>
598
599 <varlistentry id="rev">
600 <term><command>rev</command></term>
601 <listitem>
602 <para>Reverses the lines of a given file</para>
603 <indexterm zone="ch-system-util-linux rev">
604 <primary sortas="b-rev">rev</primary>
605 </indexterm>
606 </listitem>
607 </varlistentry>
608
609 <varlistentry id="rootflags">
610 <term><command>rootflags</command></term>
611 <listitem>
612 <para>Sets the rootflags in a bootable image</para>
613 <indexterm zone="ch-system-util-linux rootflags">
614 <primary sortas="b-rootflags">rootflags</primary>
615 </indexterm>
616 </listitem>
617 </varlistentry>
618
619 <varlistentry id="script">
620 <term><command>script</command></term>
621 <listitem>
622 <para>Makes a typescript of a terminal session</para>
623 <indexterm zone="ch-system-util-linux script">
624 <primary sortas="b-script">script</primary>
625 </indexterm>
626 </listitem>
627 </varlistentry>
628
629 <varlistentry id="setfdprm">
630 <term><command>setfdprm</command></term>
631 <listitem>
632 <para>Sets user-provided floppy disk parameters</para>
633 <indexterm zone="ch-system-util-linux setfdprm">
634 <primary sortas="b-setfdprm">setfdprm</primary>
635 </indexterm>
636 </listitem>
637 </varlistentry>
638
639 <varlistentry id="setsid">
640 <term><command>setsid</command></term>
641 <listitem>
642 <para>Runs the given program in a new session</para>
643 <indexterm zone="ch-system-util-linux setsid">
644 <primary sortas="b-setsid">setsid</primary>
645 </indexterm>
646 </listitem>
647 </varlistentry>
648
649 <varlistentry id="setterm">
650 <term><command>setterm</command></term>
651 <listitem>
652 <para>Sets terminal attributes</para>
653 <indexterm zone="ch-system-util-linux setterm">
654 <primary sortas="b-setterm">setterm</primary>
655 </indexterm>
656 </listitem>
657 </varlistentry>
658
659 <varlistentry id="sfdisk">
660 <term><command>sfdisk</command></term>
661 <listitem>
662 <para>A disk partition table manipulator</para>
663 <indexterm zone="ch-system-util-linux sfdisk">
664 <primary sortas="b-sfdisk">sfdisk</primary>
665 </indexterm>
666 </listitem>
667 </varlistentry>
668
669 <varlistentry id="swapdev">
670 <term><command>swapdev</command></term>
671 <listitem>
672 <para>Sets the swap device in a bootable image</para>
673 <indexterm zone="ch-system-util-linux swapdev">
674 <primary sortas="b-swapdev">swapdev</primary>
675 </indexterm>
676 </listitem>
677 </varlistentry>
678
679 <varlistentry id="swapoff">
680 <term><command>swapoff</command></term>
681 <listitem>
682 <para>Disables devices and files for paging and swapping</para>
683 <indexterm zone="ch-system-util-linux swapoff">
684 <primary sortas="b-swapoff">swapoff</primary>
685 </indexterm>
686 </listitem>
687 </varlistentry>
688
689 <varlistentry id="swapon">
690 <term><command>swapon</command></term>
691 <listitem>
692 <para>Enables devices and files for paging and swapping and
693 lists the devices and files currently in use</para>
694 <indexterm zone="ch-system-util-linux swapon">
695 <primary sortas="b-swapon">swapon</primary>
696 </indexterm>
697 </listitem>
698 </varlistentry>
699
700 <varlistentry id="tunelp">
701 <term><command>tunelp</command></term>
702 <listitem>
703 <para>Tunes the parameters of the line printer</para>
704 <indexterm zone="ch-system-util-linux tunelp">
705 <primary sortas="b-tunelp">tunelp</primary>
706 </indexterm>
707 </listitem>
708 </varlistentry>
709
710 <varlistentry id="ul">
711 <term><command>ul</command></term>
712 <listitem>
713 <para>A filter for translating underscores into escape sequences
714 indicating underlining for the terminal in use</para>
715 <indexterm zone="ch-system-util-linux ul">
716 <primary sortas="b-ul">ul</primary>
717 </indexterm>
718 </listitem>
719 </varlistentry>
720
721 <varlistentry id="umount">
722 <term><command>umount</command></term>
723 <listitem>
724 <para>Disconnects a file system from the system's file tree</para>
725 <indexterm zone="ch-system-util-linux umount">
726 <primary sortas="b-umount">umount</primary>
727 </indexterm>
728 </listitem>
729 </varlistentry>
730
731 <varlistentry id="vidmode">
732 <term><command>vidmode</command></term>
733 <listitem>
734 <para>Sets the video mode in a bootable image</para>
735 <indexterm zone="ch-system-util-linux vidmode">
736 <primary sortas="b-vidmode">vidmode</primary>
737 </indexterm>
738 </listitem>
739 </varlistentry>
740
741 <varlistentry id="whereis">
742 <term><command>whereis</command></term>
743 <listitem>
744 <para>Reports the location of the binary, source, and man page
745 for the given command</para>
746 <indexterm zone="ch-system-util-linux whereis">
747 <primary sortas="b-whereis">whereis</primary>
748 </indexterm>
749 </listitem>
750 </varlistentry>
751
752 <varlistentry id="write">
753 <term><command>write</command></term>
754 <listitem>
755 <para>Sends a message to the given user <emphasis>if</emphasis> that
756 user has not disabled receipt of such messages</para>
757 <indexterm zone="ch-system-util-linux write">
758 <primary sortas="b-write">write</primary>
759 </indexterm>
760 </listitem>
761 </varlistentry>
762
763 </variablelist>
764
765 </sect2>
766
767</sect1>
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