source: chapter06/systemd.xml@ 2ba06af

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Last change on this file since 2ba06af was 2ba06af, checked in by DJ Lucas <dj@…>, 6 years ago

Remove extraneous command.

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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-systemd" role="wrap" revision="systemd">
9 <?dbhtml filename="systemd.html"?>
10
11 <sect1info condition="script">
12 <productname>systemd</productname>
13 <productnumber>&systemd-version;</productnumber>
14 <address>&systemd-url;</address>
15 </sect1info>
16
17 <title>Systemd-&systemd-version;</title>
18
19 <indexterm zone="ch-system-systemd">
20 <primary sortas="a-systemd">systemd</primary>
21 </indexterm>
22
23 <sect2 role="package">
24 <title/>
25
26 <para>The systemd package contains programs for controlling the startup,
27 running, and shutdown of the system.</para>
28
29 <segmentedlist>
30 <segtitle>&buildtime;</segtitle>
31 <segtitle>&diskspace;</segtitle>
32
33 <seglistitem>
34 <seg>&systemd-ch6-sbu;</seg>
35 <seg>&systemd-ch6-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38 </sect2>
39
40 <sect2 role="installation">
41 <title>Installation of systemd</title>
42
43 <para>Create a symlink to work around missing xsltproc:</para>
44
45<screen><userinput remap="pre">ln -s /tools/bin/true /usr/bin/xsltproc</userinput></screen>
46 <para>Set up the man pages:</para>
47
48<screen><userinput remap="pre">tar -xf ../systemd-man-pages-235.tar.xz</userinput></screen>
49
50 <para>Prepare systemd for compilation:</para>
51
52 <screen><userinput remap="configure">cd build
53
54LANG=en_US.UTF-8 \
55meson --prefix=/usr \
56 --sysconfdir=/etc \
57 --localstatedir=/var \
58 -Dblkid=true \
59 -Dbuildtype=release \
60 -Ddefault-dnssec=no \
61 -Dfirstboot=false \
62 -Dkill-path=/bin/kill \
63 -Dkmod-path=/bin/kmod \
64 -Dldconfig=false \
65 -Dmount-path=/bin/mount \
66 -Drootprefix= \
67 -Drootlibdir=/lib \
68 -Dsplit-usr=true \
69 -Dsulogin-path=/sbin/sulogin \
70 -Dsysusers=false \
71 -Dumount-path=/bin/umount \
72 -Db_lto=false \
73 ..</userinput></screen>
74
75 <variablelist>
76 <title>The meaning of the meson options:</title>
77
78 <varlistentry>
79 <term><parameter>-D*-path=*</parameter></term>
80 <listitem>
81 <para>These switches provide location of binaries needed by
82 systemd at runtime that have not yet been installed, or who's
83 pkgconfig files are currently only in
84 <filename>/tools/lib/pkgconfig</filename>.</para>
85 </listitem>
86 </varlistentry>
87
88 <varlistentry>
89 <term><parameter>-Ddefault-dnssec=no</parameter></term>
90 <listitem>
91 <para>This switch turns off the experimental DNSSEC support.</para>
92 </listitem>
93 </varlistentry>
94
95 <varlistentry>
96 <term><parameter>-Dfirstboot=false</parameter></term>
97 <listitem>
98 <para>This switch prevents installation of systemd
99 services responsible for setting up the system for
100 the first time. They are not useful for LFS because
101 everything is done manually.</para>
102 </listitem>
103 </varlistentry>
104
105 <varlistentry>
106 <term><parameter>-Dldconfig=no</parameter></term>
107 <listitem>
108 <para>This switch prevents installation of a systemd
109 unit that runs <command>ldconfig</command> at
110 boot, making the boot time longer. Remove it if the
111 described feature is desired, even though it's not
112 useful for source distributions such as LFS.</para>
113 </listitem>
114 </varlistentry>
115
116 <varlistentry>
117 <term><parameter>-Droot*</parameter></term>
118 <listitem>
119 <para>These switches ensure that core programs and
120 shared libraries are installed in the subdirectories
121 of the root partition.</para>
122 </listitem>
123 </varlistentry>
124
125 <varlistentry>
126 <term><parameter>-Dsplit-usr=true</parameter></term>
127 <listitem>
128 <para>This switch ensures that systemd will work on
129 systems where /bin, /lib and /sbin directories are not
130 symlinks to their /usr counterparts.</para>
131 </listitem>
132 </varlistentry>
133
134 <varlistentry>
135 <term><parameter>-Dsysusers=false</parameter></term>
136 <listitem>
137 <para>This switch prevents installation of systemd
138 services responsible for setting up the
139 <filename>/etc/group</filename> and
140 <filename>/etc/passwd</filename> files. Both files
141 were created early in this chapter.</para>
142 </listitem>
143 </varlistentry>
144
145 </variablelist>
146
147 <para>Compile the package:</para>
148
149<screen><userinput remap="make">LANG=en_US.UTF-8 ninja</userinput></screen>
150<!--
151 <para>To test the package, execute the following command:</para>
152
153<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
154-->
155 <para>Install the package:</para>
156
157<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
158
159 <para>Remove an unnecessary directory:</para>
160
161<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
162
163 <para>Create the Sysvinit compatibility symlinks, so systemd is used
164 as the default init system:</para>
165
166<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
167 ln -sfv ../bin/systemctl /sbin/${tool}
168done
169ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
170
171 <para>Remove our earlier created symlink for xsltproc:</para>
172
173<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
174
175 <para>Create the <filename>/etc/machine-id</filename> file needed by
176 <command>systemd-journald</command>:</para>
177
178<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
179
180 <para>Create the <filename>/lib/systemd/systemd-user-sessions</filename>
181 script to allow unprivileged user logins without
182 <application>systemd-logind</application>:</para>
183
184<screen><userinput remap="adjust">cat &gt; /lib/systemd/systemd-user-sessions &lt;&lt; "EOF"
185#!/bin/bash
186rm -f /run/nologin
187EOF
188chmod 755 /lib/systemd/systemd-user-sessions</userinput></screen>
189
190 </sect2>
191
192 <sect2 id="contents-systemd" role="content">
193 <title>Contents of systemd</title>
194
195 <segmentedlist>
196 <segtitle>Installed programs</segtitle>
197 <segtitle>Installed libraries</segtitle>
198 <segtitle>Installed directories</segtitle>
199
200 <seglistitem>
201 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
202 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
203 reboot, runlevel, shutdown, systemctl, systemd-analyze,
204 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
205 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
206 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
207 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
208 systemd-run, systemd-socket-activate,
209 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
210 telinit, timedatectl, and udevadm</seg>
211 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
212 libnss_resolve.so.2, libnss_systemd.so.2,
213 libsystemd.so, libsystemd-shared-231.so,
214 and libudev.so</seg>
215 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
216 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
217 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
218 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
219 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
220 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
221 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
222 </seglistitem>
223 </segmentedlist>
224
225 <variablelist>
226 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
227 <?dbfo list-presentation="list"?>
228 <?dbhtml list-presentation="table"?>
229
230 <varlistentry id="bootctl">
231 <term><command>bootctl</command></term>
232 <listitem>
233 <para>used to query the firmware and boot manager settings</para>
234 <indexterm zone="ch-system-systemd bootctl">
235 <primary sortas="b-bootctl">bootctl</primary>
236 </indexterm>
237 </listitem>
238 </varlistentry>
239
240 <varlistentry id="busctl">
241 <term><command>busctl</command></term>
242 <listitem>
243 <para>Used to introspect and monitor the D-Bus bus</para>
244 <indexterm zone="ch-system-systemd busctl">
245 <primary sortas="b-busctl">busctl</primary>
246 </indexterm>
247 </listitem>
248 </varlistentry>
249
250 <varlistentry id="coredumpctl">
251 <term><command>coredumpctl</command></term>
252 <listitem>
253 <para>Used to retrieve coredumps from the systemd Journal</para>
254 <indexterm zone="ch-system-systemd coredumpctl">
255 <primary sortas="b-coredumpctl">coredumpctl</primary>
256 </indexterm>
257 </listitem>
258 </varlistentry>
259
260 <varlistentry id="halt">
261 <term><command>halt</command></term>
262 <listitem>
263 <para>Normally invokes <command>shutdown</command> with the
264 <parameter>-h</parameter> option, except when already in run-level 0,
265 then it tells the kernel to halt the system; it notes in the
266 file <filename>/var/log/wtmp</filename> that the system is being
267 brought down</para>
268 <indexterm zone="ch-system-systemd halt">
269 <primary sortas="b-halt">halt</primary>
270 </indexterm>
271 </listitem>
272 </varlistentry>
273
274 <varlistentry id="hostnamectl">
275 <term><command>hostnamectl</command></term>
276 <listitem>
277 <para>Used to query and change the system hostname and related
278 settings</para>
279 <indexterm zone="ch-system-systemd hostnamectl">
280 <primary sortas="b-hostnamectl">hostnamectl</primary>
281 </indexterm>
282 </listitem>
283 </varlistentry>
284
285 <varlistentry id="init">
286 <term><command>init</command></term>
287 <listitem>
288 <para>The first process to be started when the kernel has initialized
289 the hardware which takes over the boot process and starts all the
290 proceses it is instructed to</para>
291 <indexterm zone="ch-system-systemd init">
292 <primary sortas="b-init">init</primary>
293 </indexterm>
294 </listitem>
295 </varlistentry>
296
297 <varlistentry id="journalctl">
298 <term><command>journalctl</command></term>
299 <listitem>
300 <para>Used to query the contents of the systemd Journal</para>
301 <indexterm zone="ch-system-systemd journalctl">
302 <primary sortas="b-journalctl">journalctl</primary>
303 </indexterm>
304 </listitem>
305 </varlistentry>
306
307 <varlistentry id="kernel-install">
308 <term><command>kernel-install</command></term>
309 <listitem>
310 <para>Used to add and remove kernel and initramfs images to and
311 from /boot</para>
312 <indexterm zone="ch-system-systemd kernel-install">
313 <primary sortas="b-kernel-install">kernel-install</primary>
314 </indexterm>
315 </listitem>
316 </varlistentry>
317
318 <varlistentry id="localectl">
319 <term><command>localectl</command></term>
320 <listitem>
321 <para>Used to query and change the system locale and keyboard layout
322 settings</para>
323 <indexterm zone="ch-system-systemd localectl">
324 <primary sortas="b-localectl">localectl</primary>
325 </indexterm>
326 </listitem>
327 </varlistentry>
328
329 <varlistentry id="loginctl">
330 <term><command>loginctl</command></term>
331 <listitem>
332 <para>Used to introspect and control the state of the systemd Login
333 Manager</para>
334 <indexterm zone="ch-system-systemd loginctl">
335 <primary sortas="b-loginctl">loginctl</primary>
336 </indexterm>
337 </listitem>
338 </varlistentry>
339
340 <varlistentry id="machinectl">
341 <term><command>machinectl</command></term>
342 <listitem>
343 <para>Used to introspect and control the state of the systemd Virtual
344 Machine and Container Registration Manager</para>
345 <indexterm zone="ch-system-systemd machinectl">
346 <primary sortas="b-machinectl">machinectl</primary>
347 </indexterm>
348 </listitem>
349 </varlistentry>
350
351 <varlistentry id="networkctl">
352 <term><command>networkctl</command></term>
353 <listitem>
354 <para>Used to introspect the state of the network links as seen by
355 systemd-networkd</para>
356 <indexterm zone="ch-system-systemd networkctl">
357 <primary sortas="b-networkctl">networkctl</primary>
358 </indexterm>
359 </listitem>
360 </varlistentry>
361
362 <varlistentry id="poweroff">
363 <term><command>poweroff</command></term>
364 <listitem>
365 <para>Tells the kernel to halt the system and switch off the computer
366 (see <command>halt</command>)</para>
367 <indexterm zone="ch-system-systemd poweroff">
368 <primary sortas="b-poweroff">poweroff</primary>
369 </indexterm>
370 </listitem>
371 </varlistentry>
372
373 <varlistentry id="reboot">
374 <term><command>reboot</command></term>
375 <listitem>
376 <para>Tells the kernel to reboot the system (see
377 <command>halt</command>)</para>
378 <indexterm zone="ch-system-systemd reboot">
379 <primary sortas="b-reboot">reboot</primary>
380 </indexterm>
381 </listitem>
382 </varlistentry>
383
384 <varlistentry id="runlevel">
385 <term><command>runlevel</command></term>
386 <listitem>
387 <para>Reports the previous and the current run-level, as noted in the
388 last run-level record in <filename>/var/run/utmp</filename></para>
389 <indexterm zone="ch-system-systemd runlevel">
390 <primary sortas="b-runlevel">runlevel</primary>
391 </indexterm>
392 </listitem>
393 </varlistentry>
394
395 <varlistentry id="shutdown">
396 <term><command>shutdown</command></term>
397 <listitem>
398 <para>Brings the system down in a secure way, signaling all processes
399 and notifying all logged-in users</para>
400 <indexterm zone="ch-system-systemd shutdown">
401 <primary sortas="b-shutdown">shutdown</primary>
402 </indexterm>
403 </listitem>
404 </varlistentry>
405
406 <varlistentry id="systemctl">
407 <term><command>systemctl</command></term>
408 <listitem>
409 <para>Used to introspect and control the state of the systemd system
410 and service manager</para>
411 <indexterm zone="ch-system-systemd systemctl">
412 <primary sortas="b-systemctl">systemctl</primary>
413 </indexterm>
414 </listitem>
415 </varlistentry>
416
417 <varlistentry id="systemd-analyze">
418 <term><command>systemd-analyze</command></term>
419 <listitem>
420 <para>Used to determine system boot-up performance of the current
421 boot</para>
422 <indexterm zone="ch-system-systemd systemd-analyze">
423 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
424 </indexterm>
425 </listitem>
426 </varlistentry>
427
428 <varlistentry id="systemd-ask-password">
429 <term><command>systemd-ask-password</command></term>
430 <listitem>
431 <para>Used to query a system password or passphrase from the user,
432 using a question message specified on the command line</para>
433 <indexterm zone="ch-system-systemd systemd-ask-password">
434 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
435 </indexterm>
436 </listitem>
437 </varlistentry>
438
439 <varlistentry id="systemd-cat">
440 <term><command>systemd-cat</command></term>
441 <listitem>
442 <para>Used to connect STDOUT and STDERR of a process with the Journal
443 </para>
444 <indexterm zone="ch-system-systemd systemd-cat">
445 <primary sortas="b-systemd-cat">systemd-cat</primary>
446 </indexterm>
447 </listitem>
448 </varlistentry>
449
450 <varlistentry id="systemd-cgls">
451 <term><command>systemd-cgls</command></term>
452 <listitem>
453 <para>Recursively shows the contents of the selected Linux control
454 group hierarchy in a tree</para>
455 <indexterm zone="ch-system-systemd systemd-cgls">
456 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
457 </indexterm>
458 </listitem>
459 </varlistentry>
460
461 <varlistentry id="systemd-cgtop">
462 <term><command>systemd-cgtop</command></term>
463 <listitem>
464 <para>Shows the top control groups of the local Linux control group
465 hierarchy, ordered by their CPU, memory and disk I/O load</para>
466 <indexterm zone="ch-system-systemd systemd-cgtop">
467 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
468 </indexterm>
469 </listitem>
470 </varlistentry>
471
472 <varlistentry id="systemd-delta">
473 <term><command>systemd-delta</command></term>
474 <listitem>
475 <para>Used to identify and compare configuration files in
476 <filename class="directory">/etc</filename> that override default
477 counterparts in <filename class="directory">/usr</filename></para>
478 <indexterm zone="ch-system-systemd systemd-delta">
479 <primary sortas="b-systemd-delta">systemd-delta</primary>
480 </indexterm>
481 </listitem>
482 </varlistentry>
483
484 <varlistentry id="systemd-detect-virt">
485 <term><command>systemd-detect-virt</command></term>
486 <listitem>
487 <para>Detects execution in a virtualized environment</para>
488 <indexterm zone="ch-system-systemd systemd-detect-virt">
489 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
490 </indexterm>
491 </listitem>
492 </varlistentry>
493
494 <varlistentry id="systemd-escape">
495 <term><command>systemd-escape</command></term>
496 <listitem>
497 <para>Used to escape strings for inclusion in systemd unit
498 names</para>
499 <indexterm zone="ch-system-systemd systemd-escape">
500 <primary sortas="b-systemd-escape">systemd-escape</primary>
501 </indexterm>
502 </listitem>
503 </varlistentry>
504
505 <varlistentry id="systemd-hwdb">
506 <term><command>systemd-hwdb</command></term>
507 <listitem>
508 <para>Used to manage hardware database (hwdb)</para>
509 <indexterm zone="ch-system-systemd systemd-hwdb">
510 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
511 </indexterm>
512 </listitem>
513 </varlistentry>
514
515 <varlistentry id="systemd-inhibit">
516 <term><command>systemd-inhibit</command></term>
517 <listitem>
518 <para>Used to execute a program with a shutdown, sleep or idle
519 inhibitor lock taken</para>
520 <indexterm zone="ch-system-systemd systemd-inhibit">
521 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
522 </indexterm>
523 </listitem>
524 </varlistentry>
525
526 <varlistentry id="systemd-machine-id-setup">
527 <term><command>systemd-machine-id-setup</command></term>
528 <listitem>
529 <para>Used by system installer tools to initialize the machine ID
530 stored in <filename>/etc/machine-id</filename> at install time with a
531 randomly generated ID</para>
532 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
533 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
534 </indexterm>
535 </listitem>
536 </varlistentry>
537
538 <varlistentry id="systemd-mount">
539 <term><command>systemd-mount</command></term>
540 <listitem>
541 <para>is a tool to temporarily mount or auto-mount a drive.</para>
542 <indexterm zone="ch-system-systemd systemd-mount">
543 <primary sortas="b-systemd-mount">systemd-mount</primary>
544 </indexterm>
545 </listitem>
546 </varlistentry>
547
548 <varlistentry id="systemd-notify">
549 <term><command>systemd-notify</command></term>
550 <listitem>
551 <para>Used by daemon scripts to notify the init system about status
552 changes</para>
553 <indexterm zone="ch-system-systemd systemd-notify">
554 <primary sortas="b-systemd-notify">systemd-notify</primary>
555 </indexterm>
556 </listitem>
557 </varlistentry>
558
559 <varlistentry id="systemd-nspawn">
560 <term><command>systemd-nspawn</command></term>
561 <listitem>
562 <para>Used to run a command or OS in a light-weight namespace
563 container</para>
564 <indexterm zone="ch-system-systemd systemd-nspawn">
565 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
566 </indexterm>
567 </listitem>
568 </varlistentry>
569
570 <varlistentry id="systemd-path">
571 <term><command>systemd-path</command></term>
572 <listitem>
573 <para>Used to query system and user paths</para>
574 <indexterm zone="ch-system-systemd systemd-path">
575 <primary sortas="b-systemd-path">systemd-path</primary>
576 </indexterm>
577 </listitem>
578 </varlistentry>
579
580 <varlistentry id="systemd-resolve">
581 <term><command>systemd-resolve</command></term>
582 <listitem>
583 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
584 resource records, and services</para>
585 <indexterm zone="ch-system-systemd systemd-resolve">
586 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
587 </indexterm>
588 </listitem>
589 </varlistentry>
590
591 <varlistentry id="systemd-run">
592 <term><command>systemd-run</command></term>
593 <listitem>
594 <para>Used to create and start a transient .service or a .scope unit
595 and run the specified command in it</para>
596 <indexterm zone="ch-system-systemd systemd-run">
597 <primary sortas="b-systemd-run">systemd-run</primary>
598 </indexterm>
599 </listitem>
600 </varlistentry>
601
602 <!-- <varlistentry id="systemd-stdio-bridge">
603 <term><command>systemd-stdio-bridge</command></term>
604 <listitem>
605 <para>To be completed</para>
606 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
607 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
608 </indexterm>
609 </listitem>
610 </varlistentry> -->
611
612 <varlistentry id="systemd-socket-activate">
613 <term><command>systemd-socket-activate</command></term>
614 <listitem>
615 <para>is a tool to listen on socket devices and launch a process upon
616 connection.</para>
617 <indexterm zone="ch-system-systemd systemd-socket-activate">
618 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
619 </indexterm>
620 </listitem>
621 </varlistentry>
622
623 <varlistentry id="systemd-tmpfiles">
624 <term><command>systemd-tmpfiles</command></term>
625 <listitem>
626 <para>Creates, deletes and cleans up volatile and temporary files and
627 directories, based on the configuration file format and location
628 specified in
629 <filename class="directory">tmpfiles.d</filename> directories</para>
630 <indexterm zone="ch-system-systemd systemd-tmpfiles">
631 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
632 </indexterm>
633 </listitem>
634 </varlistentry>
635
636 <varlistentry id="systemd-tty-ask-password-agent">
637 <term><command>systemd-tty-ask-password-agent</command></term>
638 <listitem>
639 <para>Used to list or process pending systemd password requests</para>
640 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
641 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
642 </indexterm>
643 </listitem>
644 </varlistentry>
645
646 <varlistentry id="telinit">
647 <term><command>telinit</command></term>
648 <listitem>
649 <para>Tells <command>init</command> which run-level to change
650 to</para>
651 <indexterm zone="ch-system-systemd telinit">
652 <primary sortas="b-telinit">telinit</primary>
653 </indexterm>
654 </listitem>
655 </varlistentry>
656
657 <varlistentry id="timedatectl">
658 <term><command>timedatectl</command></term>
659 <listitem>
660 <para>Used to query and change the system clock and its settings
661 </para>
662 <indexterm zone="ch-system-systemd timedatectl">
663 <primary sortas="b-timedatectl">timedatectl</primary>
664 </indexterm>
665 </listitem>
666 </varlistentry>
667
668 <varlistentry id="udevadm">
669 <term><command>udevadm</command></term>
670 <listitem>
671 <para>Generic Udev administration tool: controls the udevd daemon,
672 provides info from the Udev database, monitors uevents, waits for
673 uevents to finish, tests Udev configuration, and triggers uevents
674 for a given device</para>
675 <indexterm zone="ch-system-systemd udevadm">
676 <primary sortas="b-udevadm">udevadm</primary>
677 </indexterm>
678 </listitem>
679 </varlistentry>
680
681 <varlistentry id="libsystemd">
682 <term><filename class="libraryfile">libsystemd</filename></term>
683 <listitem>
684 <para>systemd utility library</para>
685 <indexterm zone="ch-system-systemd libsystemd">
686 <primary sortas="c-libsystemd">libsystemd</primary>
687 </indexterm>
688 </listitem>
689 </varlistentry>
690
691 <varlistentry id="libudev">
692 <term><filename class="libraryfile">libudev</filename></term>
693 <listitem>
694 <para>A library to access Udev device information</para>
695 <indexterm zone="ch-system-systemd libudev">
696 <primary sortas="c-libudev">libudev</primary>
697 </indexterm>
698 </listitem>
699 </varlistentry>
700
701 </variablelist>
702
703 </sect2>
704
705</sect1>
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