source: chapter06/systemd.xml@ 7886729e

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Last change on this file since 7886729e was 81ed05f, checked in by DJ Lucas <dj@…>, 7 years ago

Use upstream systemd tarball with meson build system and supply only prebuilt man pages.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11306 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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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
47 <para>Prepare systemd for compilation:</para>
48
49<screen><userinput remap="configure">PKG_CONFIG_PATH=/usr/lib/pkgconfig:/tools/lib/pkgconfig \
50LANG=en_US.UTF-8 \
51 meson --prefix /usr \
52 --sysconfdir /etc \
53 --localstatedir /var \
54 -Dblkid=true \
55 -Dbuildtype=release \
56 -Ddefault-dnssec=no \
57 -Dfirstboot=false \
58 -Dkill-path=/bin/kill \
59 -Dkmod-path=/bin/kmod \
60 -Dldconfig=false \
61 -Dmount-path=/bin/mount \
62 -Drootprefix= \
63 -Drootlibdir=/lib \
64 -Dsplit-usr=true \
65 -Dsulogin-path=/sbin/sulogin \
66 -Dsysusers=false \
67 -Dumount-path=/bin/umount \
68 -Db_lto=false \
69 -Dc_link_args="-lblkid -lmount" \
70 -Dc_args="-I/tools/include/blkid -I/tools/include/libmount" \
71 $PWD build</userinput></screen>
72
73 <variablelist>
74 <title>The meaning of the meson options:</title>
75
76 <varlistentry>
77 <term><parameter>-D*-path=*</parameter></term>
78 <listitem>
79 <para>These switches provide location of binaries needed by
80 systemd at runtime that have not yet been installed, or who's
81 pkgconfig files are currently only in
82 <filename>/tools/lib/pkgconfig</filename>.</para>
83 </listitem>
84 </varlistentry>
85
86 <varlistentry>
87 <term><parameter>-Ddefault-dnssec=no</parameter></term>
88 <listitem>
89 <para>This switch turns off the experimental DNSSEC support.</para>
90 </listitem>
91 </varlistentry>
92
93 <varlistentry>
94 <term><parameter>-Dfirstboot=false</parameter></term>
95 <listitem>
96 <para>This switch prevents installation of systemd
97 services responsible for setting up the system for
98 the first time. They are not useful for LFS because
99 everything is done manually.</para>
100 </listitem>
101 </varlistentry>
102
103 <varlistentry>
104 <term><parameter>-Dldconfig=no</parameter></term>
105 <listitem>
106 <para>This switch prevents installation of a systemd
107 unit that runs <command>ldconfig</command> at
108 boot, making the boot time longer. Remove it if the
109 described feature is desired, even though it's not
110 useful for source distributions such as LFS.</para>
111 </listitem>
112 </varlistentry>
113
114 <varlistentry>
115 <term><parameter>-Droot*</parameter></term>
116 <listitem>
117 <para>These switches ensure that core programs and
118 shared libraries are installed in the subdirectories
119 of the root partition.</para>
120 </listitem>
121 </varlistentry>
122
123 <varlistentry>
124 <term><parameter>-Dsplit-usr=true</parameter></term>
125 <listitem>
126 <para>This switch ensures that systemd will work on
127 systems where /bin, /lib and /sbin directories are not
128 symlinks to their /usr counterparts.</para>
129 </listitem>
130 </varlistentry>
131
132 <varlistentry>
133 <term><parameter>-Dsysusers=false</parameter></term>
134 <listitem>
135 <para>This switch prevents installation of systemd
136 services responsible for setting up the
137 <filename>/etc/group</filename> and
138 <filename>/etc/passwd</filename> files. Both files
139 were created early in this chapter.</para>
140 </listitem>
141 </varlistentry>
142
143 <varlistentry>
144 <term><parameter>-Dc_link_args="-lblkid -lmount"</parameter></term>
145 <listitem>
146 <para>This switch manually adds libblkid and libmount to the
147 linker flags as they only exist in <filename>/tools/lib</filename>
148 until <application>Util-Linux</application> is installed later in
149 this chapter.</para>
150 </listitem>
151 </varlistentry>
152
153 <varlistentry>
154 <term><parameter>-Dc_args="-I/tools/include/blkid -I/tools/include/libmount"</parameter></term>
155 <listitem>
156 <para>This switch manually adds the include paths for libblkid and
157 libmount to the CFLAGS variable as the packages are not yet installed
158 in the final system.</para>
159 </listitem>
160 </varlistentry>
161
162 </variablelist>
163
164 <para>Compile the package:</para>
165
166<screen><userinput remap="make">tar -xf ../systemd-man-pages-&systemd-version;.tar.xz
167cd build
168LANG=en_US.UTF-8 ninja</userinput></screen>
169<!--
170 <para>To test the package, execute the following command:</para>
171
172<screen><userinput remap="test">LANG=en_US.UTF-8 ninja test</userinput></screen>
173-->
174 <para>Install the package:</para>
175
176<screen><userinput remap="install">LANG=en_US.UTF-8 ninja install</userinput></screen>
177
178 <para>Remove an unnecessary directory:</para>
179
180<screen><userinput remap="install">rm -rfv /usr/lib/rpm</userinput></screen>
181
182 <para>Create the Sysvinit compatibility symlinks, so systemd is used
183 as the default init system:</para>
184
185<screen><userinput remap="install">for tool in runlevel reboot shutdown poweroff halt telinit; do
186 ln -sfv ../bin/systemctl /sbin/${tool}
187done
188ln -sfv ../lib/systemd/systemd /sbin/init</userinput></screen>
189
190 <para>Remove our earlier created symlink for xsltproc:</para>
191
192<screen><userinput remap="install">rm -f /usr/bin/xsltproc</userinput></screen>
193
194 <para>Create the <filename>/etc/machine-id</filename> file needed by
195 <command>systemd-journald</command>:</para>
196
197<screen><userinput remap="adjust">systemd-machine-id-setup</userinput></screen>
198
199 </sect2>
200
201 <sect2 id="contents-systemd" role="content">
202 <title>Contents of systemd</title>
203
204 <segmentedlist>
205 <segtitle>Installed programs</segtitle>
206 <segtitle>Installed libraries</segtitle>
207 <segtitle>Installed directories</segtitle>
208
209 <seglistitem>
210 <seg>bootctl, busctl, coredumpctl, halt, hostnamectl, init, journalctl,
211 kernel-install, localectl, loginctl, machinectl, networkctl, poweroff,
212 reboot, runlevel, shutdown, systemctl, systemd-analyze,
213 systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
214 systemd-delta, systemd-detect-virt, systemd-escape, systemd-hwdb,
215 systemd-inhibit, systemd-machine-id-setup, systemd-mount,
216 systemd-notify, systemd-nspawn, systemd-path, systemd-resolve,
217 systemd-run, systemd-socket-activate,
218 systemd-stdio-bridge, systemd-tmpfiles, systemd-tty-ask-password-agent,
219 telinit, timedatectl, and udevadm</seg>
220 <seg>libnss_myhostname.so.2, libnss_mymachines.so.2,
221 libnss_resolve.so.2, libnss_systemd.so.2,
222 libsystemd.so, libsystemd-shared-231.so,
223 and libudev.so</seg>
224 <seg>/etc/binfmt.d, /etc/init.d, /etc/kernel, /etc/modules-load.d,
225 /etc/sysctl.d, /etc/systemd, /etc/tmpfiles.d, /etc/udev,
226 /etc/xdg/systemd, /lib/systemd, /lib/udev, /usr/include/systemd,
227 /usr/lib/binfmt.d, /usr/lib/kernel, /usr/lib/modules-load.d,
228 /usr/lib/sysctl.d, /usr/lib/systemd, /usr/lib/tmpfiles.d,
229 /usr/share/doc/systemd-&systemd-version;, /usr/share/factory,
230 /usr/share/systemd, /var/lib/systemd, and /var/log/journal</seg>
231 </seglistitem>
232 </segmentedlist>
233
234 <variablelist>
235 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
236 <?dbfo list-presentation="list"?>
237 <?dbhtml list-presentation="table"?>
238
239 <varlistentry id="bootctl">
240 <term><command>bootctl</command></term>
241 <listitem>
242 <para>used to query the firmware and boot manager settings</para>
243 <indexterm zone="ch-system-systemd bootctl">
244 <primary sortas="b-bootctl">bootctl</primary>
245 </indexterm>
246 </listitem>
247 </varlistentry>
248
249 <varlistentry id="busctl">
250 <term><command>busctl</command></term>
251 <listitem>
252 <para>Used to introspect and monitor the D-Bus bus</para>
253 <indexterm zone="ch-system-systemd busctl">
254 <primary sortas="b-busctl">busctl</primary>
255 </indexterm>
256 </listitem>
257 </varlistentry>
258
259 <varlistentry id="coredumpctl">
260 <term><command>coredumpctl</command></term>
261 <listitem>
262 <para>Used to retrieve coredumps from the systemd Journal</para>
263 <indexterm zone="ch-system-systemd coredumpctl">
264 <primary sortas="b-coredumpctl">coredumpctl</primary>
265 </indexterm>
266 </listitem>
267 </varlistentry>
268
269 <varlistentry id="halt">
270 <term><command>halt</command></term>
271 <listitem>
272 <para>Normally invokes <command>shutdown</command> with the
273 <parameter>-h</parameter> option, except when already in run-level 0,
274 then it tells the kernel to halt the system; it notes in the
275 file <filename>/var/log/wtmp</filename> that the system is being
276 brought down</para>
277 <indexterm zone="ch-system-systemd halt">
278 <primary sortas="b-halt">halt</primary>
279 </indexterm>
280 </listitem>
281 </varlistentry>
282
283 <varlistentry id="hostnamectl">
284 <term><command>hostnamectl</command></term>
285 <listitem>
286 <para>Used to query and change the system hostname and related
287 settings</para>
288 <indexterm zone="ch-system-systemd hostnamectl">
289 <primary sortas="b-hostnamectl">hostnamectl</primary>
290 </indexterm>
291 </listitem>
292 </varlistentry>
293
294 <varlistentry id="init">
295 <term><command>init</command></term>
296 <listitem>
297 <para>The first process to be started when the kernel has initialized
298 the hardware which takes over the boot process and starts all the
299 proceses it is instructed to</para>
300 <indexterm zone="ch-system-systemd init">
301 <primary sortas="b-init">init</primary>
302 </indexterm>
303 </listitem>
304 </varlistentry>
305
306 <varlistentry id="journalctl">
307 <term><command>journalctl</command></term>
308 <listitem>
309 <para>Used to query the contents of the systemd Journal</para>
310 <indexterm zone="ch-system-systemd journalctl">
311 <primary sortas="b-journalctl">journalctl</primary>
312 </indexterm>
313 </listitem>
314 </varlistentry>
315
316 <varlistentry id="kernel-install">
317 <term><command>kernel-install</command></term>
318 <listitem>
319 <para>Used to add and remove kernel and initramfs images to and
320 from /boot</para>
321 <indexterm zone="ch-system-systemd kernel-install">
322 <primary sortas="b-kernel-install">kernel-install</primary>
323 </indexterm>
324 </listitem>
325 </varlistentry>
326
327 <varlistentry id="localectl">
328 <term><command>localectl</command></term>
329 <listitem>
330 <para>Used to query and change the system locale and keyboard layout
331 settings</para>
332 <indexterm zone="ch-system-systemd localectl">
333 <primary sortas="b-localectl">localectl</primary>
334 </indexterm>
335 </listitem>
336 </varlistentry>
337
338 <varlistentry id="loginctl">
339 <term><command>loginctl</command></term>
340 <listitem>
341 <para>Used to introspect and control the state of the systemd Login
342 Manager</para>
343 <indexterm zone="ch-system-systemd loginctl">
344 <primary sortas="b-loginctl">loginctl</primary>
345 </indexterm>
346 </listitem>
347 </varlistentry>
348
349 <varlistentry id="machinectl">
350 <term><command>machinectl</command></term>
351 <listitem>
352 <para>Used to introspect and control the state of the systemd Virtual
353 Machine and Container Registration Manager</para>
354 <indexterm zone="ch-system-systemd machinectl">
355 <primary sortas="b-machinectl">machinectl</primary>
356 </indexterm>
357 </listitem>
358 </varlistentry>
359
360 <varlistentry id="networkctl">
361 <term><command>networkctl</command></term>
362 <listitem>
363 <para>Used to introspect the state of the network links as seen by
364 systemd-networkd</para>
365 <indexterm zone="ch-system-systemd networkctl">
366 <primary sortas="b-networkctl">networkctl</primary>
367 </indexterm>
368 </listitem>
369 </varlistentry>
370
371 <varlistentry id="poweroff">
372 <term><command>poweroff</command></term>
373 <listitem>
374 <para>Tells the kernel to halt the system and switch off the computer
375 (see <command>halt</command>)</para>
376 <indexterm zone="ch-system-systemd poweroff">
377 <primary sortas="b-poweroff">poweroff</primary>
378 </indexterm>
379 </listitem>
380 </varlistentry>
381
382 <varlistentry id="reboot">
383 <term><command>reboot</command></term>
384 <listitem>
385 <para>Tells the kernel to reboot the system (see
386 <command>halt</command>)</para>
387 <indexterm zone="ch-system-systemd reboot">
388 <primary sortas="b-reboot">reboot</primary>
389 </indexterm>
390 </listitem>
391 </varlistentry>
392
393 <varlistentry id="runlevel">
394 <term><command>runlevel</command></term>
395 <listitem>
396 <para>Reports the previous and the current run-level, as noted in the
397 last run-level record in <filename>/var/run/utmp</filename></para>
398 <indexterm zone="ch-system-systemd runlevel">
399 <primary sortas="b-runlevel">runlevel</primary>
400 </indexterm>
401 </listitem>
402 </varlistentry>
403
404 <varlistentry id="shutdown">
405 <term><command>shutdown</command></term>
406 <listitem>
407 <para>Brings the system down in a secure way, signaling all processes
408 and notifying all logged-in users</para>
409 <indexterm zone="ch-system-systemd shutdown">
410 <primary sortas="b-shutdown">shutdown</primary>
411 </indexterm>
412 </listitem>
413 </varlistentry>
414
415 <varlistentry id="systemctl">
416 <term><command>systemctl</command></term>
417 <listitem>
418 <para>Used to introspect and control the state of the systemd system
419 and service manager</para>
420 <indexterm zone="ch-system-systemd systemctl">
421 <primary sortas="b-systemctl">systemctl</primary>
422 </indexterm>
423 </listitem>
424 </varlistentry>
425
426 <varlistentry id="systemd-analyze">
427 <term><command>systemd-analyze</command></term>
428 <listitem>
429 <para>Used to determine system boot-up performance of the current
430 boot</para>
431 <indexterm zone="ch-system-systemd systemd-analyze">
432 <primary sortas="b-systemd-analyze">systemd-analyze</primary>
433 </indexterm>
434 </listitem>
435 </varlistentry>
436
437 <varlistentry id="systemd-ask-password">
438 <term><command>systemd-ask-password</command></term>
439 <listitem>
440 <para>Used to query a system password or passphrase from the user,
441 using a question message specified on the command line</para>
442 <indexterm zone="ch-system-systemd systemd-ask-password">
443 <primary sortas="b-systemd-ask-password">systemd-ask-password</primary>
444 </indexterm>
445 </listitem>
446 </varlistentry>
447
448 <varlistentry id="systemd-cat">
449 <term><command>systemd-cat</command></term>
450 <listitem>
451 <para>Used to connect STDOUT and STDERR of a process with the Journal
452 </para>
453 <indexterm zone="ch-system-systemd systemd-cat">
454 <primary sortas="b-systemd-cat">systemd-cat</primary>
455 </indexterm>
456 </listitem>
457 </varlistentry>
458
459 <varlistentry id="systemd-cgls">
460 <term><command>systemd-cgls</command></term>
461 <listitem>
462 <para>Recursively shows the contents of the selected Linux control
463 group hierarchy in a tree</para>
464 <indexterm zone="ch-system-systemd systemd-cgls">
465 <primary sortas="b-systemd-cgls">systemd-cgls</primary>
466 </indexterm>
467 </listitem>
468 </varlistentry>
469
470 <varlistentry id="systemd-cgtop">
471 <term><command>systemd-cgtop</command></term>
472 <listitem>
473 <para>Shows the top control groups of the local Linux control group
474 hierarchy, ordered by their CPU, memory and disk I/O load</para>
475 <indexterm zone="ch-system-systemd systemd-cgtop">
476 <primary sortas="b-systemd-cgtop">systemd-cgtop</primary>
477 </indexterm>
478 </listitem>
479 </varlistentry>
480
481 <varlistentry id="systemd-delta">
482 <term><command>systemd-delta</command></term>
483 <listitem>
484 <para>Used to identify and compare configuration files in
485 <filename class="directory">/etc</filename> that override default
486 counterparts in <filename class="directory">/usr</filename></para>
487 <indexterm zone="ch-system-systemd systemd-delta">
488 <primary sortas="b-systemd-delta">systemd-delta</primary>
489 </indexterm>
490 </listitem>
491 </varlistentry>
492
493 <varlistentry id="systemd-detect-virt">
494 <term><command>systemd-detect-virt</command></term>
495 <listitem>
496 <para>Detects execution in a virtualized environment</para>
497 <indexterm zone="ch-system-systemd systemd-detect-virt">
498 <primary sortas="b-systemd-detect-virt">systemd-detect-virt</primary>
499 </indexterm>
500 </listitem>
501 </varlistentry>
502
503 <varlistentry id="systemd-escape">
504 <term><command>systemd-escape</command></term>
505 <listitem>
506 <para>Used to escape strings for inclusion in systemd unit
507 names</para>
508 <indexterm zone="ch-system-systemd systemd-escape">
509 <primary sortas="b-systemd-escape">systemd-escape</primary>
510 </indexterm>
511 </listitem>
512 </varlistentry>
513
514 <varlistentry id="systemd-hwdb">
515 <term><command>systemd-hwdb</command></term>
516 <listitem>
517 <para>Used to manage hardware database (hwdb)</para>
518 <indexterm zone="ch-system-systemd systemd-hwdb">
519 <primary sortas="b-systemd-hwdb">systemd-hwdb</primary>
520 </indexterm>
521 </listitem>
522 </varlistentry>
523
524 <varlistentry id="systemd-inhibit">
525 <term><command>systemd-inhibit</command></term>
526 <listitem>
527 <para>Used to execute a program with a shutdown, sleep or idle
528 inhibitor lock taken</para>
529 <indexterm zone="ch-system-systemd systemd-inhibit">
530 <primary sortas="b-systemd-inhibit">systemd-inhibit</primary>
531 </indexterm>
532 </listitem>
533 </varlistentry>
534
535 <varlistentry id="systemd-machine-id-setup">
536 <term><command>systemd-machine-id-setup</command></term>
537 <listitem>
538 <para>Used by system installer tools to initialize the machine ID
539 stored in <filename>/etc/machine-id</filename> at install time with a
540 randomly generated ID</para>
541 <indexterm zone="ch-system-systemd systemd-machine-id-setup">
542 <primary sortas="b-systemd-machine-id-setup">systemd-machine-id-setup</primary>
543 </indexterm>
544 </listitem>
545 </varlistentry>
546
547 <varlistentry id="systemd-mount">
548 <term><command>systemd-mount</command></term>
549 <listitem>
550 <para>is a tool to temporarily mount or auto-mount a drive.</para>
551 <indexterm zone="ch-system-systemd systemd-mount">
552 <primary sortas="b-systemd-mount">systemd-mount</primary>
553 </indexterm>
554 </listitem>
555 </varlistentry>
556
557 <varlistentry id="systemd-notify">
558 <term><command>systemd-notify</command></term>
559 <listitem>
560 <para>Used by daemon scripts to notify the init system about status
561 changes</para>
562 <indexterm zone="ch-system-systemd systemd-notify">
563 <primary sortas="b-systemd-notify">systemd-notify</primary>
564 </indexterm>
565 </listitem>
566 </varlistentry>
567
568 <varlistentry id="systemd-nspawn">
569 <term><command>systemd-nspawn</command></term>
570 <listitem>
571 <para>Used to run a command or OS in a light-weight namespace
572 container</para>
573 <indexterm zone="ch-system-systemd systemd-nspawn">
574 <primary sortas="b-systemd-nspawn">systemd-nspawn</primary>
575 </indexterm>
576 </listitem>
577 </varlistentry>
578
579 <varlistentry id="systemd-path">
580 <term><command>systemd-path</command></term>
581 <listitem>
582 <para>Used to query system and user paths</para>
583 <indexterm zone="ch-system-systemd systemd-path">
584 <primary sortas="b-systemd-path">systemd-path</primary>
585 </indexterm>
586 </listitem>
587 </varlistentry>
588
589 <varlistentry id="systemd-resolve">
590 <term><command>systemd-resolve</command></term>
591 <listitem>
592 <para>Used to resolve domain names, IPV4 and IPv6 addresses, DNS
593 resource records, and services</para>
594 <indexterm zone="ch-system-systemd systemd-resolve">
595 <primary sortas="b-systemd-resolve">systemd-resolve</primary>
596 </indexterm>
597 </listitem>
598 </varlistentry>
599
600 <varlistentry id="systemd-run">
601 <term><command>systemd-run</command></term>
602 <listitem>
603 <para>Used to create and start a transient .service or a .scope unit
604 and run the specified command in it</para>
605 <indexterm zone="ch-system-systemd systemd-run">
606 <primary sortas="b-systemd-run">systemd-run</primary>
607 </indexterm>
608 </listitem>
609 </varlistentry>
610
611 <!-- <varlistentry id="systemd-stdio-bridge">
612 <term><command>systemd-stdio-bridge</command></term>
613 <listitem>
614 <para>To be completed</para>
615 <indexterm zone="ch-system-systemd systemd-stdio-bridge">
616 <primary sortas="b-systemd-stdio-bridge">systemd-stdio-bridge</primary>
617 </indexterm>
618 </listitem>
619 </varlistentry> -->
620
621 <varlistentry id="systemd-socket-activate">
622 <term><command>systemd-socket-activate</command></term>
623 <listitem>
624 <para>is a tool to listen on socket devices and launch a process upon
625 connection.</para>
626 <indexterm zone="ch-system-systemd systemd-socket-activate">
627 <primary sortas="b-systemd-socket-activate">systemd-socket-activate</primary>
628 </indexterm>
629 </listitem>
630 </varlistentry>
631
632 <varlistentry id="systemd-tmpfiles">
633 <term><command>systemd-tmpfiles</command></term>
634 <listitem>
635 <para>Creates, deletes and cleans up volatile and temporary files and
636 directories, based on the configuration file format and location
637 specified in
638 <filename class="directory">tmpfiles.d</filename> directories</para>
639 <indexterm zone="ch-system-systemd systemd-tmpfiles">
640 <primary sortas="b-systemd-tmpfiles">systemd-tmpfiles</primary>
641 </indexterm>
642 </listitem>
643 </varlistentry>
644
645 <varlistentry id="systemd-tty-ask-password-agent">
646 <term><command>systemd-tty-ask-password-agent</command></term>
647 <listitem>
648 <para>Used to list or process pending systemd password requests</para>
649 <indexterm zone="ch-system-systemd systemd-tty-ask-password-agent">
650 <primary sortas="b-systemd-tty-ask-password-agent">systemd-tty-ask-password-agent</primary>
651 </indexterm>
652 </listitem>
653 </varlistentry>
654
655 <varlistentry id="telinit">
656 <term><command>telinit</command></term>
657 <listitem>
658 <para>Tells <command>init</command> which run-level to change
659 to</para>
660 <indexterm zone="ch-system-systemd telinit">
661 <primary sortas="b-telinit">telinit</primary>
662 </indexterm>
663 </listitem>
664 </varlistentry>
665
666 <varlistentry id="timedatectl">
667 <term><command>timedatectl</command></term>
668 <listitem>
669 <para>Used to query and change the system clock and its settings
670 </para>
671 <indexterm zone="ch-system-systemd timedatectl">
672 <primary sortas="b-timedatectl">timedatectl</primary>
673 </indexterm>
674 </listitem>
675 </varlistentry>
676
677 <varlistentry id="udevadm">
678 <term><command>udevadm</command></term>
679 <listitem>
680 <para>Generic Udev administration tool: controls the udevd daemon,
681 provides info from the Udev database, monitors uevents, waits for
682 uevents to finish, tests Udev configuration, and triggers uevents
683 for a given device</para>
684 <indexterm zone="ch-system-systemd udevadm">
685 <primary sortas="b-udevadm">udevadm</primary>
686 </indexterm>
687 </listitem>
688 </varlistentry>
689
690 <varlistentry id="libsystemd">
691 <term><filename class="libraryfile">libsystemd</filename></term>
692 <listitem>
693 <para>systemd utility library</para>
694 <indexterm zone="ch-system-systemd libsystemd">
695 <primary sortas="c-libsystemd">libsystemd</primary>
696 </indexterm>
697 </listitem>
698 </varlistentry>
699
700 <varlistentry id="libudev">
701 <term><filename class="libraryfile">libudev</filename></term>
702 <listitem>
703 <para>A library to access Udev device information</para>
704 <indexterm zone="ch-system-systemd libudev">
705 <primary sortas="c-libudev">libudev</primary>
706 </indexterm>
707 </listitem>
708 </varlistentry>
709
710 </variablelist>
711
712 </sect2>
713
714</sect1>
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