source: final-system/common/util-linux.xml@ 08911a6

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