source: BOOK/final-system/common/util-linux.xml @ c331850

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
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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  <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 the changes to the Linux 2.6.18
51    headers:</para>
52
53<screen os="p4"><userinput>patch -Np1 -i ../&util-linux-syscall_fixes-patch;</userinput></screen>
54
55    <para os="p5">The following patch fixes swapon.c - it tries to find the variable R_OK, but
56    the header that has R_OK is not included:</para>
57
58<screen os="p6"><userinput>patch -Np1 -i ../&util-linux-missing_header-patch;</userinput></screen>
59
60    <para os="p7">Due to a change in headers some of Util-linux will not build.
61    This patch will change the utilization of llseek to lseek. This fix has
62    been applied to the development version of Util-linux:</para>
63
64<screen os="p8"><userinput>patch -Np1 -i ../&util-linux-lseek-patch;</userinput></screen>
65
66    <para os="a">Prepare Util-linux for compilation:</para>
67
68<screen os="b"><userinput>./configure</userinput></screen>
69
70    <para os="c">Compile the package:</para>
71
72<screen os="d"><userinput>make HAVE_KILL=yes HAVE_SLN=yes</userinput></screen>
73
74    <variablelist os="e">
75      <title>The meaning of the make parameters:</title>
76
77      <varlistentry os="e1">
78        <term><parameter>HAVE_KILL=yes</parameter></term>
79        <listitem>
80          <para>This prevents the <command>kill</command> program (already
81          installed by Procps) from being built and installed again.</para>
82        </listitem>
83      </varlistentry>
84
85      <varlistentry os="e2">
86        <term><parameter>HAVE_SLN=yes</parameter></term>
87        <listitem>
88          <para>This prevents the <command>sln</command> program (a
89          statically linked version of <command>ln</command> already installed
90          by Glibc) from being built and installed again.</para>
91        </listitem>
92      </varlistentry>
93
94    </variablelist>
95
96    <para os="f">This package does not come with a test suite.</para>
97
98    <para os="g">Install the package and move the <command>logger</command> binary
99    to <filename class="directory">/bin</filename> as it is needed by the
100    CLFS-Bootscripts package:</para>
101
102<screen os="h"><userinput>make HAVE_KILL=yes HAVE_SLN=yes install
103mv -v /usr/bin/logger /bin</userinput></screen>
104
105  </sect2>
106
107  <sect2 id="contents-util-linux" role="content">
108    <title>Contents of Util-linux</title>
109
110    <segmentedlist>
111      <segtitle>Installed programs</segtitle>
112
113      <seglistitem>
114        <seg>agetty, arch, blockdev, cal, cfdisk, chkdupexe, col, colcrt,
115        colrm, column, ctrlaltdel, cytune, ddate, dmesg, elvtune, fdformat,
116        fdisk, flock, fsck.cramfs, fsck.minix, getopt, hexdump, hwclock, ipcrm,
117        ipcs, isosize, line, logger, look, losetup, mcookie, mkfs, mkfs.bfs,
118        mkfs.cramfs, mkfs.minix, mkswap, more, mount, namei, pg, pivot_root,
119        ramsize (link to rdev), raw, rdev, readprofile, rename, renice, rev,
120        rootflags (link to rdev), script, setfdprm, setsid, setterm, sfdisk,
121        swapoff (link to swapon), swapon, tailf, tunelp, ul, umount, vidmode
122        (link to rdev), whereis, and write</seg>
123      </seglistitem>
124    </segmentedlist>
125
126    <variablelist>
127      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
128      <?dbfo list-presentation="list"?>
129      <?dbhtml list-presentation="table"?>
130
131      <varlistentry id="agetty">
132        <term><command>agetty</command></term>
133        <listitem>
134          <para>Opens a tty port, prompts for a login name,
135          and then invokes the <command>login</command> program</para>
136          <indexterm zone="ch-system-util-linux agetty">
137            <primary sortas="b-agetty">agetty</primary>
138          </indexterm>
139        </listitem>
140      </varlistentry>
141
142      <varlistentry id="arch">
143        <term><command>arch</command></term>
144        <listitem>
145          <para>Reports the machine's architecture</para>
146          <indexterm zone="ch-system-util-linux arch">
147            <primary sortas="b-arch">arch</primary>
148          </indexterm>
149        </listitem>
150      </varlistentry>
151
152      <varlistentry id="blockdev">
153        <term><command>blockdev</command></term>
154        <listitem>
155          <para>Allows users to call block device ioctls from the command
156          line</para>
157          <indexterm zone="ch-system-util-linux blockdev">
158            <primary sortas="b-blockdev">blockdev</primary>
159          </indexterm>
160        </listitem>
161      </varlistentry>
162
163      <varlistentry id="cal">
164        <term><command>cal</command></term>
165        <listitem>
166          <para>Displays a simple calendar</para>
167          <indexterm zone="ch-system-util-linux cal">
168            <primary sortas="b-cal">cal</primary>
169          </indexterm>
170        </listitem>
171      </varlistentry>
172
173      <varlistentry id="cfdisk">
174        <term><command>cfdisk</command></term>
175        <listitem>
176          <para>Manipulates the partition table of the given device</para>
177          <indexterm zone="ch-system-util-linux cfdisk">
178            <primary sortas="b-cfdisk">cfdisk</primary>
179          </indexterm>
180        </listitem>
181      </varlistentry>
182
183      <varlistentry id="chkdupexe">
184        <term><command>chkdupexe</command></term>
185        <listitem>
186          <para>Finds duplicate executables</para>
187          <indexterm zone="ch-system-util-linux chkdupexe">
188            <primary sortas="b-chkdupexe">chkdupexe</primary>
189          </indexterm>
190        </listitem>
191      </varlistentry>
192
193      <varlistentry id="col">
194        <term><command>col</command></term>
195        <listitem>
196          <para>Filters out reverse line feeds</para>
197          <indexterm zone="ch-system-util-linux col">
198            <primary sortas="b-col">col</primary>
199          </indexterm>
200        </listitem>
201      </varlistentry>
202
203      <varlistentry id="colcrt">
204        <term><command>colcrt</command></term>
205        <listitem>
206          <para>Filters <command>nroff</command> output for terminals
207          that lack some capabilities, such as overstriking and half-lines</para>
208          <indexterm zone="ch-system-util-linux colcrt">
209            <primary sortas="b-colcrt">colcrt</primary>
210          </indexterm>
211        </listitem>
212      </varlistentry>
213
214      <varlistentry id="colrm">
215        <term><command>colrm</command></term>
216        <listitem>
217          <para>Filters out the given columns</para>
218          <indexterm zone="ch-system-util-linux colrm">
219            <primary sortas="b-colrm">colrm</primary>
220          </indexterm>
221        </listitem>
222      </varlistentry>
223
224      <varlistentry id="column">
225        <term><command>column</command></term>
226        <listitem>
227          <para>Formats a given file into multiple columns</para>
228          <indexterm zone="ch-system-util-linux column">
229            <primary sortas="b-column">column</primary>
230          </indexterm>
231        </listitem>
232      </varlistentry>
233
234      <varlistentry id="ctrlaltdel">
235        <term><command>ctrlaltdel</command></term>
236        <listitem>
237          <para>Sets the function of the Ctrl+Alt+Del key combination to a
238          hard or a soft reset</para>
239          <indexterm zone="ch-system-util-linux ctrlaltdel">
240            <primary sortas="b-ctrlaltdel">ctrlaltdel</primary>
241          </indexterm>
242        </listitem>
243      </varlistentry>
244
245      <varlistentry id="cytune">
246        <term><command>cytune</command></term>
247        <listitem>
248          <para>Tunes the parameters of the serial line drivers for
249          Cyclades cards</para>
250          <indexterm zone="ch-system-util-linux cytune">
251            <primary sortas="b-cytune">cytune</primary>
252          </indexterm>
253        </listitem>
254      </varlistentry>
255
256      <varlistentry id="ddate">
257        <term><command>ddate</command></term>
258        <listitem>
259          <para>Gives the Discordian date or converts the given Gregorian date
260          to a Discordian one</para>
261          <indexterm zone="ch-system-util-linux ddate">
262            <primary sortas="b-ddate">ddate</primary>
263          </indexterm>
264        </listitem>
265      </varlistentry>
266
267      <varlistentry id="dmesg">
268        <term><command>dmesg</command></term>
269        <listitem>
270          <para>Dumps the kernel boot messages</para>
271          <indexterm zone="ch-system-util-linux dmesg">
272            <primary sortas="b-dmesg">dmesg</primary>
273          </indexterm>
274        </listitem>
275      </varlistentry>
276
277      <varlistentry id="elvtune">
278        <term><command>elvtune</command></term>
279        <listitem>
280          <para>Tunes the performance and interactivity of a block
281          device</para>
282          <indexterm zone="ch-system-util-linux elvtune">
283            <primary sortas="b-elvtune">elvtune</primary>
284          </indexterm>
285        </listitem>
286      </varlistentry>
287
288      <varlistentry id="fdformat">
289        <term><command>fdformat</command></term>
290        <listitem>
291          <para>Low-level formats a floppy disk</para>
292          <indexterm zone="ch-system-util-linux fdformat">
293            <primary sortas="b-fdformat">fdformat</primary>
294          </indexterm>
295        </listitem>
296      </varlistentry>
297
298      <varlistentry id="fdisk">
299        <term><command>fdisk</command></term>
300        <listitem>
301          <para>Manipulates the partition table of the given device</para>
302          <indexterm zone="ch-system-util-linux fdisk">
303            <primary sortas="b-fdisk">fdisk</primary>
304          </indexterm>
305        </listitem>
306      </varlistentry>
307
308      <varlistentry id="flock">
309        <term><command>flock</command></term>
310        <listitem>
311          <para>Acquires a file lock and then executes a command with the lock
312          held</para>
313          <indexterm zone="ch-system-util-linux flock">
314            <primary sortas="b-flock">flock</primary>
315          </indexterm>
316        </listitem>
317      </varlistentry>
318
319      <varlistentry id="fsck.cramfs">
320        <term><command>fsck.cramfs</command></term>
321        <listitem>
322          <para>Performs a consistency check on the Cramfs file system on the
323          given device</para>
324          <indexterm zone="ch-system-util-linux fsck.cramfs">
325            <primary sortas="b-fsck.cramfs">fsck.cramfs</primary>
326          </indexterm>
327        </listitem>
328      </varlistentry>
329
330      <varlistentry id="fsck.minix">
331        <term><command>fsck.minix</command></term>
332        <listitem>
333          <para>Performs a consistency check on the Minix file system on the
334          given device</para>
335          <indexterm zone="ch-system-util-linux fsck.minix">
336            <primary sortas="b-fsck.minix">fsck.minix</primary>
337          </indexterm>
338        </listitem>
339      </varlistentry>
340
341      <varlistentry id="getopt">
342        <term><command>getopt</command></term>
343        <listitem>
344          <para>Parses options in the given command line</para>
345          <indexterm zone="ch-system-util-linux getopt">
346            <primary sortas="b-getopt">getopt</primary>
347          </indexterm>
348        </listitem>
349      </varlistentry>
350
351      <varlistentry id="hexdump">
352        <term><command>hexdump</command></term>
353        <listitem>
354          <para>Dumps the given file in hexadecimal or in another given
355          format</para>
356          <indexterm zone="ch-system-util-linux hexdump">
357            <primary sortas="b-hexdump">hexdump</primary>
358          </indexterm>
359        </listitem>
360      </varlistentry>
361
362      <varlistentry id="hwclock">
363        <term><command>hwclock</command></term>
364        <listitem>
365          <para>Reads or sets the system's hardware clock, also called
366          the Real-Time Clock (RTC) or Basic Input-Output System (BIOS)
367          clock</para>
368          <indexterm zone="ch-system-util-linux hwclock">
369            <primary sortas="b-hwclock">hwclock</primary>
370          </indexterm>
371        </listitem>
372      </varlistentry>
373
374      <varlistentry id="ipcrm">
375        <term><command>ipcrm</command></term>
376        <listitem>
377          <para>Removes the given Inter-Process Communication (IPC) resource</para>
378          <indexterm zone="ch-system-util-linux ipcrm">
379            <primary sortas="b-ipcrm">ipcrm</primary>
380          </indexterm>
381        </listitem>
382      </varlistentry>
383
384      <varlistentry id="ipcs">
385        <term><command>ipcs</command></term>
386        <listitem>
387          <para>Provides IPC status information</para>
388          <indexterm zone="ch-system-util-linux ipcs">
389            <primary sortas="b-ipcs">ipcs</primary>
390          </indexterm>
391        </listitem>
392      </varlistentry>
393
394      <varlistentry id="isosize">
395        <term><command>isosize</command></term>
396        <listitem>
397          <para>Reports the size of an iso9660 file system</para>
398          <indexterm zone="ch-system-util-linux isosize">
399            <primary sortas="b-isosize">isosize</primary>
400          </indexterm>
401        </listitem>
402      </varlistentry>
403
404      <varlistentry id="line">
405        <term><command>line</command></term>
406        <listitem>
407          <para>Copies a single line</para>
408          <indexterm zone="ch-system-util-linux line">
409            <primary sortas="b-line">line</primary>
410          </indexterm>
411        </listitem>
412      </varlistentry>
413
414      <varlistentry id="logger">
415        <term><command>logger</command></term>
416        <listitem>
417          <para>Enters the given message into the system log</para>
418          <indexterm zone="ch-system-util-linux logger">
419            <primary sortas="b-logger">logger</primary>
420          </indexterm>
421        </listitem>
422      </varlistentry>
423
424      <varlistentry id="look">
425        <term><command>look</command></term>
426        <listitem>
427          <para>Displays lines that begin with the given string</para>
428          <indexterm zone="ch-system-util-linux look">
429            <primary sortas="b-look">look</primary>
430          </indexterm>
431        </listitem>
432      </varlistentry>
433
434      <varlistentry id="losetup">
435        <term><command>losetup</command></term>
436        <listitem>
437          <para>Sets up and controls loop devices</para>
438          <indexterm zone="ch-system-util-linux losetup">
439            <primary sortas="b-losetup">losetup</primary>
440          </indexterm>
441        </listitem>
442      </varlistentry>
443
444      <varlistentry id="mcookie">
445        <term><command>mcookie</command></term>
446        <listitem>
447          <para>Generates magic cookies (128-bit random hexadecimal numbers) for
448          <command>xauth</command></para>
449          <indexterm zone="ch-system-util-linux mcookie">
450            <primary sortas="b-mcookie">mcookie</primary>
451          </indexterm>
452        </listitem>
453      </varlistentry>
454
455      <varlistentry id="mkfs">
456        <term><command>mkfs</command></term>
457        <listitem>
458          <para>Builds a file system on a device (usually a hard disk
459          partition)</para>
460          <indexterm zone="ch-system-util-linux mkfs">
461            <primary sortas="b-mkfs">mkfs</primary>
462          </indexterm>
463        </listitem>
464      </varlistentry>
465
466      <varlistentry id="mkfs.bfs">
467        <term><command>mkfs.bfs</command></term>
468        <listitem>
469          <para>Creates a Santa Cruz Operations (SCO) bfs file system</para>
470          <indexterm zone="ch-system-util-linux mkfs.bfs">
471            <primary sortas="b-mkfs.bfs">mkfs.bfs</primary>
472          </indexterm>
473        </listitem>
474      </varlistentry>
475
476      <varlistentry id="mkfs.cramfs">
477        <term><command>mkfs.cramfs</command></term>
478        <listitem>
479          <para>Creates a cramfs file system</para>
480          <indexterm zone="ch-system-util-linux mkfs.cramfs">
481            <primary sortas="b-mkfs.cramfs">mkfs.cramfs</primary>
482          </indexterm>
483        </listitem>
484      </varlistentry>
485
486      <varlistentry id="mkfs.minix">
487        <term><command>mkfs.minix</command></term>
488        <listitem>
489          <para>Creates a Minix file system</para>
490          <indexterm zone="ch-system-util-linux mkfs.minix">
491            <primary sortas="b-mkfs.minix">mkfs.minix</primary>
492          </indexterm>
493        </listitem>
494      </varlistentry>
495
496      <varlistentry id="mkswap">
497        <term><command>mkswap</command></term>
498        <listitem>
499          <para>Initializes the given device or file to be used as a swap
500          area</para>
501          <indexterm zone="ch-system-util-linux mkswap">
502            <primary sortas="b-mkswap">mkswap</primary>
503          </indexterm>
504        </listitem>
505      </varlistentry>
506
507      <varlistentry id="more">
508        <term><command>more</command></term>
509        <listitem>
510          <para>A filter for paging through text one screen at a time</para>
511          <indexterm zone="ch-system-util-linux more">
512            <primary sortas="b-more">more</primary>
513          </indexterm>
514        </listitem>
515      </varlistentry>
516
517      <varlistentry id="mount">
518        <term><command>mount</command></term>
519        <listitem>
520          <para>Attaches the file system on the given device to a specified
521          directory in the file-system tree</para>
522          <indexterm zone="ch-system-util-linux mount">
523            <primary sortas="b-mount">mount</primary>
524          </indexterm>
525        </listitem>
526      </varlistentry>
527
528      <varlistentry id="namei">
529        <term><command>namei</command></term>
530        <listitem>
531          <para>Shows the symbolic links in the given pathnames</para>
532          <indexterm zone="ch-system-util-linux namei">
533            <primary sortas="b-namei">namei</primary>
534          </indexterm>
535        </listitem>
536      </varlistentry>
537
538      <varlistentry id="pg">
539        <term><command>pg</command></term>
540        <listitem>
541          <para>Displays a text file one screen full at a time</para>
542          <indexterm zone="ch-system-util-linux pg">
543            <primary sortas="b-pg">pg</primary>
544          </indexterm>
545        </listitem>
546      </varlistentry>
547
548      <varlistentry id="pivot_root">
549        <term><command>pivot_root</command></term>
550        <listitem>
551          <para>Makes the given file system the new root file system of the
552          current process</para>
553          <indexterm zone="ch-system-util-linux pivot_root">
554            <primary sortas="b-pivot_root">pivot_root</primary>
555          </indexterm>
556        </listitem>
557      </varlistentry>
558
559      <varlistentry id="ramsize">
560        <term><command>ramsize</command></term>
561        <listitem>
562          <para>Sets the size of the RAM disk in a bootable image</para>
563          <indexterm zone="ch-system-util-linux ramsize">
564            <primary sortas="b-ramsize">ramsize</primary>
565          </indexterm>
566        </listitem>
567      </varlistentry>
568
569      <varlistentry id="raw">
570        <term><command>raw</command></term>
571        <listitem>
572          <para>Used to bind a Linux raw character device to a block
573          device</para>
574          <indexterm zone="ch-system-util-linux raw">
575            <primary sortas="b-raw">raw</primary>
576          </indexterm>
577        </listitem>
578      </varlistentry>
579
580      <varlistentry id="rdev">
581        <term><command>rdev</command></term>
582        <listitem>
583          <para>Queries and sets the root device, among other things, in a
584          bootable image</para>
585          <indexterm zone="ch-system-util-linux rdev">
586            <primary sortas="b-rdev">rdev</primary>
587          </indexterm>
588        </listitem>
589      </varlistentry>
590
591      <varlistentry id="readprofile">
592        <term><command>readprofile</command></term>
593        <listitem>
594          <para>Reads kernel profiling information</para>
595          <indexterm zone="ch-system-util-linux readprofile">
596            <primary sortas="b-readprofile">readprofile</primary>
597          </indexterm>
598        </listitem>
599      </varlistentry>
600
601      <varlistentry id="rename">
602        <term><command>rename</command></term>
603        <listitem>
604          <para>Renames the given files, replacing a given string with
605          another</para>
606          <indexterm zone="ch-system-util-linux rename">
607            <primary sortas="b-rename">rename</primary>
608          </indexterm>
609        </listitem>
610      </varlistentry>
611
612      <varlistentry id="renice">
613        <term><command>renice</command></term>
614        <listitem>
615          <para>Alters the priority of running processes</para>
616          <indexterm zone="ch-system-util-linux renice">
617            <primary sortas="b-renice">renice</primary>
618          </indexterm>
619        </listitem>
620      </varlistentry>
621
622      <varlistentry id="rev">
623        <term><command>rev</command></term>
624        <listitem>
625          <para>Reverses the lines of a given file</para>
626          <indexterm zone="ch-system-util-linux rev">
627            <primary sortas="b-rev">rev</primary>
628          </indexterm>
629        </listitem>
630      </varlistentry>
631
632      <varlistentry id="rootflags">
633        <term><command>rootflags</command></term>
634        <listitem>
635          <para>Sets the rootflags in a bootable image</para>
636          <indexterm zone="ch-system-util-linux rootflags">
637            <primary sortas="b-rootflags">rootflags</primary>
638          </indexterm>
639        </listitem>
640      </varlistentry>
641
642      <varlistentry id="script">
643        <term><command>script</command></term>
644        <listitem>
645          <para>Makes a typescript of a terminal session</para>
646          <indexterm zone="ch-system-util-linux script">
647            <primary sortas="b-script">script</primary>
648          </indexterm>
649        </listitem>
650      </varlistentry>
651
652      <varlistentry id="setfdprm">
653        <term><command>setfdprm</command></term>
654        <listitem>
655          <para>Sets user-provided floppy disk parameters</para>
656          <indexterm zone="ch-system-util-linux setfdprm">
657            <primary sortas="b-setfdprm">setfdprm</primary>
658          </indexterm>
659        </listitem>
660      </varlistentry>
661
662      <varlistentry id="setsid">
663        <term><command>setsid</command></term>
664        <listitem>
665          <para>Runs the given program in a new session</para>
666          <indexterm zone="ch-system-util-linux setsid">
667            <primary sortas="b-setsid">setsid</primary>
668          </indexterm>
669        </listitem>
670      </varlistentry>
671
672      <varlistentry id="setterm">
673        <term><command>setterm</command></term>
674        <listitem>
675          <para>Sets terminal attributes</para>
676          <indexterm zone="ch-system-util-linux setterm">
677            <primary sortas="b-setterm">setterm</primary>
678          </indexterm>
679        </listitem>
680      </varlistentry>
681
682      <varlistentry id="sfdisk">
683        <term><command>sfdisk</command></term>
684        <listitem>
685          <para>A disk partition table manipulator</para>
686          <indexterm zone="ch-system-util-linux sfdisk">
687            <primary sortas="b-sfdisk">sfdisk</primary>
688          </indexterm>
689        </listitem>
690      </varlistentry>
691
692      <varlistentry id="swapoff">
693        <term><command>swapoff</command></term>
694        <listitem>
695          <para>Disables devices and files for paging and swapping</para>
696          <indexterm zone="ch-system-util-linux swapoff">
697            <primary sortas="b-swapoff">swapoff</primary>
698          </indexterm>
699        </listitem>
700      </varlistentry>
701
702      <varlistentry id="swapon">
703        <term><command>swapon</command></term>
704        <listitem>
705          <para>Enables devices and files for paging and swapping and
706          lists the devices and files currently in use</para>
707          <indexterm zone="ch-system-util-linux swapon">
708            <primary sortas="b-swapon">swapon</primary>
709          </indexterm>
710        </listitem>
711      </varlistentry>
712
713      <varlistentry id="tailf">
714        <term><command>tailf</command></term>
715        <listitem>
716          <para>Tracks the growth of a log file. Displays the last 10 lines
717          of a log file, then continues displaying any new entries in the
718          log file as they are created</para>
719          <indexterm zone="ch-system-util-linux tailf">
720            <primary sortas="b-tailf">tailf</primary>
721          </indexterm>
722        </listitem>
723      </varlistentry>
724
725      <varlistentry id="tunelp">
726        <term><command>tunelp</command></term>
727        <listitem>
728          <para>Tunes the parameters of the line printer</para>
729          <indexterm zone="ch-system-util-linux tunelp">
730            <primary sortas="b-tunelp">tunelp</primary>
731          </indexterm>
732        </listitem>
733      </varlistentry>
734
735      <varlistentry id="ul">
736        <term><command>ul</command></term>
737        <listitem>
738          <para>A filter for translating underscores into escape sequences
739          indicating underlining for the terminal in use</para>
740          <indexterm zone="ch-system-util-linux ul">
741            <primary sortas="b-ul">ul</primary>
742          </indexterm>
743        </listitem>
744      </varlistentry>
745
746      <varlistentry id="umount">
747        <term><command>umount</command></term>
748        <listitem>
749          <para>Disconnects a file system from the system's file tree</para>
750          <indexterm zone="ch-system-util-linux umount">
751            <primary sortas="b-umount">umount</primary>
752          </indexterm>
753        </listitem>
754      </varlistentry>
755
756      <varlistentry id="vidmode">
757        <term><command>vidmode</command></term>
758        <listitem>
759          <para>Sets the video mode in a bootable image</para>
760          <indexterm zone="ch-system-util-linux vidmode">
761            <primary sortas="b-vidmode">vidmode</primary>
762          </indexterm>
763        </listitem>
764      </varlistentry>
765
766      <varlistentry id="whereis">
767        <term><command>whereis</command></term>
768        <listitem>
769          <para>Reports the location of the binary, source, and man page
770          for the given command</para>
771          <indexterm zone="ch-system-util-linux whereis">
772            <primary sortas="b-whereis">whereis</primary>
773          </indexterm>
774        </listitem>
775      </varlistentry>
776
777      <varlistentry id="write">
778        <term><command>write</command></term>
779        <listitem>
780          <para>Sends a message to the given user <emphasis>if</emphasis> that
781          user has not disabled receipt of such messages</para>
782          <indexterm zone="ch-system-util-linux write">
783            <primary sortas="b-write">write</primary>
784          </indexterm>
785        </listitem>
786      </varlistentry>
787
788    </variablelist>
789
790  </sect2>
791
792</sect1>
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