source: BOOK/final-system/common/util-linux.xml @ aa18ac0

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
Last change on this file since aa18ac0 was aa18ac0, checked in by Manuel Canales Esparcia <manuel@…>, 17 years ago

Updated trunk book sources to use DocBook?-XML DTD 4.5.
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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 util-linux will not build. This patch will change
61    the utilization of llseek to lseek. This change is in the new release of util-linux:</para>
62
63<screen os="p8"><userinput>patch -Np1 -i ../&util-linux-lseek-patch;</userinput></screen>
64
65    <para os="a">Prepare Util-linux for compilation:</para>
66
67<screen os="b"><userinput>./configure</userinput></screen>
68
69    <para os="c">Compile the package:</para>
70
71<screen os="d"><userinput>make HAVE_KILL=yes HAVE_SLN=yes</userinput></screen>
72
73    <variablelist os="e">
74      <title>The meaning of the make parameters:</title>
75
76      <varlistentry os="e1">
77        <term><parameter>HAVE_KILL=yes</parameter></term>
78        <listitem>
79          <para>This prevents the <command>kill</command> program (already
80          installed by Procps) from being built and installed again.</para>
81        </listitem>
82      </varlistentry>
83
84      <varlistentry os="e2">
85        <term><parameter>HAVE_SLN=yes</parameter></term>
86        <listitem>
87          <para>This prevents the <command>sln</command> program (a
88          statically linked version of <command>ln</command> already installed
89          by Glibc) from being built and installed again.</para>
90        </listitem>
91      </varlistentry>
92
93    </variablelist>
94
95    <para os="f">This package does not come with a test suite.</para>
96
97    <para os="g">Install the package and move the <command>logger</command> binary
98    to <filename class="directory">/bin</filename> as it is needed by the
99    CLFS-Bootscripts package:</para>
100
101<screen os="h"><userinput>make HAVE_KILL=yes HAVE_SLN=yes install
102mv -v /usr/bin/logger /bin</userinput></screen>
103
104  </sect2>
105
106  <sect2 id="contents-util-linux" role="content">
107    <title>Contents of Util-linux</title>
108
109    <segmentedlist>
110      <segtitle>Installed programs</segtitle>
111
112      <seglistitem>
113        <seg>agetty, arch, blockdev, cal, cfdisk, chkdupexe, col, colcrt,
114        colrm, column, ctrlaltdel, cytune, ddate, dmesg, elvtune, fdformat,
115        fdisk, flock, fsck.cramfs, fsck.minix, getopt, hexdump, hwclock, ipcrm,
116        ipcs, isosize, line, logger, look, losetup, mcookie, mkfs, mkfs.bfs,
117        mkfs.cramfs, mkfs.minix, mkswap, more, mount, namei, pg, pivot_root,
118        ramsize (link to rdev), raw, rdev, readprofile, rename, renice, rev,
119        rootflags (link to rdev), script, setfdprm, setsid, setterm, sfdisk,
120        swapoff (link to swapon), swapon, tailf, tunelp, ul, umount, vidmode
121        (link to rdev), whereis, and write</seg>
122      </seglistitem>
123    </segmentedlist>
124
125    <variablelist>
126      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
127      <?dbfo list-presentation="list"?>
128      <?dbhtml list-presentation="table"?>
129
130      <varlistentry id="agetty">
131        <term><command>agetty</command></term>
132        <listitem>
133          <para>Opens a tty port, prompts for a login name,
134          and then invokes the <command>login</command> program</para>
135          <indexterm zone="ch-system-util-linux agetty">
136            <primary sortas="b-agetty">agetty</primary>
137          </indexterm>
138        </listitem>
139      </varlistentry>
140
141      <varlistentry id="arch">
142        <term><command>arch</command></term>
143        <listitem>
144          <para>Reports the machine's architecture</para>
145          <indexterm zone="ch-system-util-linux arch">
146            <primary sortas="b-arch">arch</primary>
147          </indexterm>
148        </listitem>
149      </varlistentry>
150
151      <varlistentry id="blockdev">
152        <term><command>blockdev</command></term>
153        <listitem>
154          <para>Allows users to call block device ioctls from the command
155          line</para>
156          <indexterm zone="ch-system-util-linux blockdev">
157            <primary sortas="b-blockdev">blockdev</primary>
158          </indexterm>
159        </listitem>
160      </varlistentry>
161
162      <varlistentry id="cal">
163        <term><command>cal</command></term>
164        <listitem>
165          <para>Displays a simple calendar</para>
166          <indexterm zone="ch-system-util-linux cal">
167            <primary sortas="b-cal">cal</primary>
168          </indexterm>
169        </listitem>
170      </varlistentry>
171
172      <varlistentry id="cfdisk">
173        <term><command>cfdisk</command></term>
174        <listitem>
175          <para>Manipulates the partition table of the given device</para>
176          <indexterm zone="ch-system-util-linux cfdisk">
177            <primary sortas="b-cfdisk">cfdisk</primary>
178          </indexterm>
179        </listitem>
180      </varlistentry>
181
182      <varlistentry id="chkdupexe">
183        <term><command>chkdupexe</command></term>
184        <listitem>
185          <para>Finds duplicate executables</para>
186          <indexterm zone="ch-system-util-linux chkdupexe">
187            <primary sortas="b-chkdupexe">chkdupexe</primary>
188          </indexterm>
189        </listitem>
190      </varlistentry>
191
192      <varlistentry id="col">
193        <term><command>col</command></term>
194        <listitem>
195          <para>Filters out reverse line feeds</para>
196          <indexterm zone="ch-system-util-linux col">
197            <primary sortas="b-col">col</primary>
198          </indexterm>
199        </listitem>
200      </varlistentry>
201
202      <varlistentry id="colcrt">
203        <term><command>colcrt</command></term>
204        <listitem>
205          <para>Filters <command>nroff</command> output for terminals
206          that lack some capabilities, such as overstriking and half-lines</para>
207          <indexterm zone="ch-system-util-linux colcrt">
208            <primary sortas="b-colcrt">colcrt</primary>
209          </indexterm>
210        </listitem>
211      </varlistentry>
212
213      <varlistentry id="colrm">
214        <term><command>colrm</command></term>
215        <listitem>
216          <para>Filters out the given columns</para>
217          <indexterm zone="ch-system-util-linux colrm">
218            <primary sortas="b-colrm">colrm</primary>
219          </indexterm>
220        </listitem>
221      </varlistentry>
222
223      <varlistentry id="column">
224        <term><command>column</command></term>
225        <listitem>
226          <para>Formats a given file into multiple columns</para>
227          <indexterm zone="ch-system-util-linux column">
228            <primary sortas="b-column">column</primary>
229          </indexterm>
230        </listitem>
231      </varlistentry>
232
233      <varlistentry id="ctrlaltdel">
234        <term><command>ctrlaltdel</command></term>
235        <listitem>
236          <para>Sets the function of the Ctrl+Alt+Del key combination to a
237          hard or a soft reset</para>
238          <indexterm zone="ch-system-util-linux ctrlaltdel">
239            <primary sortas="b-ctrlaltdel">ctrlaltdel</primary>
240          </indexterm>
241        </listitem>
242      </varlistentry>
243
244      <varlistentry id="cytune">
245        <term><command>cytune</command></term>
246        <listitem>
247          <para>Tunes the parameters of the serial line drivers for
248          Cyclades cards</para>
249          <indexterm zone="ch-system-util-linux cytune">
250            <primary sortas="b-cytune">cytune</primary>
251          </indexterm>
252        </listitem>
253      </varlistentry>
254
255      <varlistentry id="ddate">
256        <term><command>ddate</command></term>
257        <listitem>
258          <para>Gives the Discordian date or converts the given Gregorian date
259          to a Discordian one</para>
260          <indexterm zone="ch-system-util-linux ddate">
261            <primary sortas="b-ddate">ddate</primary>
262          </indexterm>
263        </listitem>
264      </varlistentry>
265
266      <varlistentry id="dmesg">
267        <term><command>dmesg</command></term>
268        <listitem>
269          <para>Dumps the kernel boot messages</para>
270          <indexterm zone="ch-system-util-linux dmesg">
271            <primary sortas="b-dmesg">dmesg</primary>
272          </indexterm>
273        </listitem>
274      </varlistentry>
275
276      <varlistentry id="elvtune">
277        <term><command>elvtune</command></term>
278        <listitem>
279          <para>Tunes the performance and interactivity of a block
280          device</para>
281          <indexterm zone="ch-system-util-linux elvtune">
282            <primary sortas="b-elvtune">elvtune</primary>
283          </indexterm>
284        </listitem>
285      </varlistentry>
286
287      <varlistentry id="fdformat">
288        <term><command>fdformat</command></term>
289        <listitem>
290          <para>Low-level formats a floppy disk</para>
291          <indexterm zone="ch-system-util-linux fdformat">
292            <primary sortas="b-fdformat">fdformat</primary>
293          </indexterm>
294        </listitem>
295      </varlistentry>
296
297      <varlistentry id="fdisk">
298        <term><command>fdisk</command></term>
299        <listitem>
300          <para>Manipulates the partition table of the given device</para>
301          <indexterm zone="ch-system-util-linux fdisk">
302            <primary sortas="b-fdisk">fdisk</primary>
303          </indexterm>
304        </listitem>
305      </varlistentry>
306
307      <varlistentry id="flock">
308        <term><command>flock</command></term>
309        <listitem>
310          <para>Acquires a file lock and then executes a command with the lock
311          held</para>
312          <indexterm zone="ch-system-util-linux flock">
313            <primary sortas="b-flock">flock</primary>
314          </indexterm>
315        </listitem>
316      </varlistentry>
317
318      <varlistentry id="fsck.cramfs">
319        <term><command>fsck.cramfs</command></term>
320        <listitem>
321          <para>Performs a consistency check on the Cramfs file system on the
322          given device</para>
323          <indexterm zone="ch-system-util-linux fsck.cramfs">
324            <primary sortas="b-fsck.cramfs">fsck.cramfs</primary>
325          </indexterm>
326        </listitem>
327      </varlistentry>
328
329      <varlistentry id="fsck.minix">
330        <term><command>fsck.minix</command></term>
331        <listitem>
332          <para>Performs a consistency check on the Minix file system on the
333          given device</para>
334          <indexterm zone="ch-system-util-linux fsck.minix">
335            <primary sortas="b-fsck.minix">fsck.minix</primary>
336          </indexterm>
337        </listitem>
338      </varlistentry>
339
340      <varlistentry id="getopt">
341        <term><command>getopt</command></term>
342        <listitem>
343          <para>Parses options in the given command line</para>
344          <indexterm zone="ch-system-util-linux getopt">
345            <primary sortas="b-getopt">getopt</primary>
346          </indexterm>
347        </listitem>
348      </varlistentry>
349
350      <varlistentry id="hexdump">
351        <term><command>hexdump</command></term>
352        <listitem>
353          <para>Dumps the given file in hexadecimal or in another given
354          format</para>
355          <indexterm zone="ch-system-util-linux hexdump">
356            <primary sortas="b-hexdump">hexdump</primary>
357          </indexterm>
358        </listitem>
359      </varlistentry>
360
361      <varlistentry id="hwclock">
362        <term><command>hwclock</command></term>
363        <listitem>
364          <para>Reads or sets the system's hardware clock, also called
365          the Real-Time Clock (RTC) or Basic Input-Output System (BIOS)
366          clock</para>
367          <indexterm zone="ch-system-util-linux hwclock">
368            <primary sortas="b-hwclock">hwclock</primary>
369          </indexterm>
370        </listitem>
371      </varlistentry>
372
373      <varlistentry id="ipcrm">
374        <term><command>ipcrm</command></term>
375        <listitem>
376          <para>Removes the given Inter-Process Communication (IPC) resource</para>
377          <indexterm zone="ch-system-util-linux ipcrm">
378            <primary sortas="b-ipcrm">ipcrm</primary>
379          </indexterm>
380        </listitem>
381      </varlistentry>
382
383      <varlistentry id="ipcs">
384        <term><command>ipcs</command></term>
385        <listitem>
386          <para>Provides IPC status information</para>
387          <indexterm zone="ch-system-util-linux ipcs">
388            <primary sortas="b-ipcs">ipcs</primary>
389          </indexterm>
390        </listitem>
391      </varlistentry>
392
393      <varlistentry id="isosize">
394        <term><command>isosize</command></term>
395        <listitem>
396          <para>Reports the size of an iso9660 file system</para>
397          <indexterm zone="ch-system-util-linux isosize">
398            <primary sortas="b-isosize">isosize</primary>
399          </indexterm>
400        </listitem>
401      </varlistentry>
402
403      <varlistentry id="line">
404        <term><command>line</command></term>
405        <listitem>
406          <para>Copies a single line</para>
407          <indexterm zone="ch-system-util-linux line">
408            <primary sortas="b-line">line</primary>
409          </indexterm>
410        </listitem>
411      </varlistentry>
412
413      <varlistentry id="logger">
414        <term><command>logger</command></term>
415        <listitem>
416          <para>Enters the given message into the system log</para>
417          <indexterm zone="ch-system-util-linux logger">
418            <primary sortas="b-logger">logger</primary>
419          </indexterm>
420        </listitem>
421      </varlistentry>
422
423      <varlistentry id="look">
424        <term><command>look</command></term>
425        <listitem>
426          <para>Displays lines that begin with the given string</para>
427          <indexterm zone="ch-system-util-linux look">
428            <primary sortas="b-look">look</primary>
429          </indexterm>
430        </listitem>
431      </varlistentry>
432
433      <varlistentry id="losetup">
434        <term><command>losetup</command></term>
435        <listitem>
436          <para>Sets up and controls loop devices</para>
437          <indexterm zone="ch-system-util-linux losetup">
438            <primary sortas="b-losetup">losetup</primary>
439          </indexterm>
440        </listitem>
441      </varlistentry>
442
443      <varlistentry id="mcookie">
444        <term><command>mcookie</command></term>
445        <listitem>
446          <para>Generates magic cookies (128-bit random hexadecimal numbers) for
447          <command>xauth</command></para>
448          <indexterm zone="ch-system-util-linux mcookie">
449            <primary sortas="b-mcookie">mcookie</primary>
450          </indexterm>
451        </listitem>
452      </varlistentry>
453
454      <varlistentry id="mkfs">
455        <term><command>mkfs</command></term>
456        <listitem>
457          <para>Builds a file system on a device (usually a hard disk
458          partition)</para>
459          <indexterm zone="ch-system-util-linux mkfs">
460            <primary sortas="b-mkfs">mkfs</primary>
461          </indexterm>
462        </listitem>
463      </varlistentry>
464
465      <varlistentry id="mkfs.bfs">
466        <term><command>mkfs.bfs</command></term>
467        <listitem>
468          <para>Creates a Santa Cruz Operations (SCO) bfs file system</para>
469          <indexterm zone="ch-system-util-linux mkfs.bfs">
470            <primary sortas="b-mkfs.bfs">mkfs.bfs</primary>
471          </indexterm>
472        </listitem>
473      </varlistentry>
474
475      <varlistentry id="mkfs.cramfs">
476        <term><command>mkfs.cramfs</command></term>
477        <listitem>
478          <para>Creates a cramfs file system</para>
479          <indexterm zone="ch-system-util-linux mkfs.cramfs">
480            <primary sortas="b-mkfs.cramfs">mkfs.cramfs</primary>
481          </indexterm>
482        </listitem>
483      </varlistentry>
484
485      <varlistentry id="mkfs.minix">
486        <term><command>mkfs.minix</command></term>
487        <listitem>
488          <para>Creates a Minix file system</para>
489          <indexterm zone="ch-system-util-linux mkfs.minix">
490            <primary sortas="b-mkfs.minix">mkfs.minix</primary>
491          </indexterm>
492        </listitem>
493      </varlistentry>
494
495      <varlistentry id="mkswap">
496        <term><command>mkswap</command></term>
497        <listitem>
498          <para>Initializes the given device or file to be used as a swap
499          area</para>
500          <indexterm zone="ch-system-util-linux mkswap">
501            <primary sortas="b-mkswap">mkswap</primary>
502          </indexterm>
503        </listitem>
504      </varlistentry>
505
506      <varlistentry id="more">
507        <term><command>more</command></term>
508        <listitem>
509          <para>A filter for paging through text one screen at a time</para>
510          <indexterm zone="ch-system-util-linux more">
511            <primary sortas="b-more">more</primary>
512          </indexterm>
513        </listitem>
514      </varlistentry>
515
516      <varlistentry id="mount">
517        <term><command>mount</command></term>
518        <listitem>
519          <para>Attaches the file system on the given device to a specified
520          directory in the file-system tree</para>
521          <indexterm zone="ch-system-util-linux mount">
522            <primary sortas="b-mount">mount</primary>
523          </indexterm>
524        </listitem>
525      </varlistentry>
526
527      <varlistentry id="namei">
528        <term><command>namei</command></term>
529        <listitem>
530          <para>Shows the symbolic links in the given pathnames</para>
531          <indexterm zone="ch-system-util-linux namei">
532            <primary sortas="b-namei">namei</primary>
533          </indexterm>
534        </listitem>
535      </varlistentry>
536
537      <varlistentry id="pg">
538        <term><command>pg</command></term>
539        <listitem>
540          <para>Displays a text file one screen full at a time</para>
541          <indexterm zone="ch-system-util-linux pg">
542            <primary sortas="b-pg">pg</primary>
543          </indexterm>
544        </listitem>
545      </varlistentry>
546
547      <varlistentry id="pivot_root">
548        <term><command>pivot_root</command></term>
549        <listitem>
550          <para>Makes the given file system the new root file system of the
551          current process</para>
552          <indexterm zone="ch-system-util-linux pivot_root">
553            <primary sortas="b-pivot_root">pivot_root</primary>
554          </indexterm>
555        </listitem>
556      </varlistentry>
557
558      <varlistentry id="ramsize">
559        <term><command>ramsize</command></term>
560        <listitem>
561          <para>Sets the size of the RAM disk in a bootable image</para>
562          <indexterm zone="ch-system-util-linux ramsize">
563            <primary sortas="b-ramsize">ramsize</primary>
564          </indexterm>
565        </listitem>
566      </varlistentry>
567
568      <varlistentry id="raw">
569        <term><command>raw</command></term>
570        <listitem>
571          <para>Used to bind a Linux raw character device to a block
572          device</para>
573          <indexterm zone="ch-system-util-linux raw">
574            <primary sortas="b-raw">raw</primary>
575          </indexterm>
576        </listitem>
577      </varlistentry>
578
579      <varlistentry id="rdev">
580        <term><command>rdev</command></term>
581        <listitem>
582          <para>Queries and sets the root device, among other things, in a
583          bootable image</para>
584          <indexterm zone="ch-system-util-linux rdev">
585            <primary sortas="b-rdev">rdev</primary>
586          </indexterm>
587        </listitem>
588      </varlistentry>
589
590      <varlistentry id="readprofile">
591        <term><command>readprofile</command></term>
592        <listitem>
593          <para>Reads kernel profiling information</para>
594          <indexterm zone="ch-system-util-linux readprofile">
595            <primary sortas="b-readprofile">readprofile</primary>
596          </indexterm>
597        </listitem>
598      </varlistentry>
599
600      <varlistentry id="rename">
601        <term><command>rename</command></term>
602        <listitem>
603          <para>Renames the given files, replacing a given string with
604          another</para>
605          <indexterm zone="ch-system-util-linux rename">
606            <primary sortas="b-rename">rename</primary>
607          </indexterm>
608        </listitem>
609      </varlistentry>
610
611      <varlistentry id="renice">
612        <term><command>renice</command></term>
613        <listitem>
614          <para>Alters the priority of running processes</para>
615          <indexterm zone="ch-system-util-linux renice">
616            <primary sortas="b-renice">renice</primary>
617          </indexterm>
618        </listitem>
619      </varlistentry>
620
621      <varlistentry id="rev">
622        <term><command>rev</command></term>
623        <listitem>
624          <para>Reverses the lines of a given file</para>
625          <indexterm zone="ch-system-util-linux rev">
626            <primary sortas="b-rev">rev</primary>
627          </indexterm>
628        </listitem>
629      </varlistentry>
630
631      <varlistentry id="rootflags">
632        <term><command>rootflags</command></term>
633        <listitem>
634          <para>Sets the rootflags in a bootable image</para>
635          <indexterm zone="ch-system-util-linux rootflags">
636            <primary sortas="b-rootflags">rootflags</primary>
637          </indexterm>
638        </listitem>
639      </varlistentry>
640
641      <varlistentry id="script">
642        <term><command>script</command></term>
643        <listitem>
644          <para>Makes a typescript of a terminal session</para>
645          <indexterm zone="ch-system-util-linux script">
646            <primary sortas="b-script">script</primary>
647          </indexterm>
648        </listitem>
649      </varlistentry>
650
651      <varlistentry id="setfdprm">
652        <term><command>setfdprm</command></term>
653        <listitem>
654          <para>Sets user-provided floppy disk parameters</para>
655          <indexterm zone="ch-system-util-linux setfdprm">
656            <primary sortas="b-setfdprm">setfdprm</primary>
657          </indexterm>
658        </listitem>
659      </varlistentry>
660
661      <varlistentry id="setsid">
662        <term><command>setsid</command></term>
663        <listitem>
664          <para>Runs the given program in a new session</para>
665          <indexterm zone="ch-system-util-linux setsid">
666            <primary sortas="b-setsid">setsid</primary>
667          </indexterm>
668        </listitem>
669      </varlistentry>
670
671      <varlistentry id="setterm">
672        <term><command>setterm</command></term>
673        <listitem>
674          <para>Sets terminal attributes</para>
675          <indexterm zone="ch-system-util-linux setterm">
676            <primary sortas="b-setterm">setterm</primary>
677          </indexterm>
678        </listitem>
679      </varlistentry>
680
681      <varlistentry id="sfdisk">
682        <term><command>sfdisk</command></term>
683        <listitem>
684          <para>A disk partition table manipulator</para>
685          <indexterm zone="ch-system-util-linux sfdisk">
686            <primary sortas="b-sfdisk">sfdisk</primary>
687          </indexterm>
688        </listitem>
689      </varlistentry>
690
691      <varlistentry id="swapoff">
692        <term><command>swapoff</command></term>
693        <listitem>
694          <para>Disables devices and files for paging and swapping</para>
695          <indexterm zone="ch-system-util-linux swapoff">
696            <primary sortas="b-swapoff">swapoff</primary>
697          </indexterm>
698        </listitem>
699      </varlistentry>
700
701      <varlistentry id="swapon">
702        <term><command>swapon</command></term>
703        <listitem>
704          <para>Enables devices and files for paging and swapping and
705          lists the devices and files currently in use</para>
706          <indexterm zone="ch-system-util-linux swapon">
707            <primary sortas="b-swapon">swapon</primary>
708          </indexterm>
709        </listitem>
710      </varlistentry>
711
712      <varlistentry id="tailf">
713        <term><command>tailf</command></term>
714        <listitem>
715          <para>Tracks the growth of a log file. Displays the last 10 lines
716          of a log file, then continues displaying any new entries in the
717          log file as they are created</para>
718          <indexterm zone="ch-system-util-linux tailf">
719            <primary sortas="b-tailf">tailf</primary>
720          </indexterm>
721        </listitem>
722      </varlistentry>
723
724      <varlistentry id="tunelp">
725        <term><command>tunelp</command></term>
726        <listitem>
727          <para>Tunes the parameters of the line printer</para>
728          <indexterm zone="ch-system-util-linux tunelp">
729            <primary sortas="b-tunelp">tunelp</primary>
730          </indexterm>
731        </listitem>
732      </varlistentry>
733
734      <varlistentry id="ul">
735        <term><command>ul</command></term>
736        <listitem>
737          <para>A filter for translating underscores into escape sequences
738          indicating underlining for the terminal in use</para>
739          <indexterm zone="ch-system-util-linux ul">
740            <primary sortas="b-ul">ul</primary>
741          </indexterm>
742        </listitem>
743      </varlistentry>
744
745      <varlistentry id="umount">
746        <term><command>umount</command></term>
747        <listitem>
748          <para>Disconnects a file system from the system's file tree</para>
749          <indexterm zone="ch-system-util-linux umount">
750            <primary sortas="b-umount">umount</primary>
751          </indexterm>
752        </listitem>
753      </varlistentry>
754
755      <varlistentry id="vidmode">
756        <term><command>vidmode</command></term>
757        <listitem>
758          <para>Sets the video mode in a bootable image</para>
759          <indexterm zone="ch-system-util-linux vidmode">
760            <primary sortas="b-vidmode">vidmode</primary>
761          </indexterm>
762        </listitem>
763      </varlistentry>
764
765      <varlistentry id="whereis">
766        <term><command>whereis</command></term>
767        <listitem>
768          <para>Reports the location of the binary, source, and man page
769          for the given command</para>
770          <indexterm zone="ch-system-util-linux whereis">
771            <primary sortas="b-whereis">whereis</primary>
772          </indexterm>
773        </listitem>
774      </varlistentry>
775
776      <varlistentry id="write">
777        <term><command>write</command></term>
778        <listitem>
779          <para>Sends a message to the given user <emphasis>if</emphasis> that
780          user has not disabled receipt of such messages</para>
781          <indexterm zone="ch-system-util-linux write">
782            <primary sortas="b-write">write</primary>
783          </indexterm>
784        </listitem>
785      </varlistentry>
786
787    </variablelist>
788
789  </sect2>
790
791</sect1>
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