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Diffstat (limited to 'chapter06/sysvinit.xml')
| -rw-r--r-- | chapter06/sysvinit.xml | 141 |
1 files changed, 105 insertions, 36 deletions
diff --git a/chapter06/sysvinit.xml b/chapter06/sysvinit.xml index 8c3cb6c8e..31095948d 100644 --- a/chapter06/sysvinit.xml +++ b/chapter06/sysvinit.xml @@ -103,83 +103,152 @@ speakers.</para> </sect2> -<sect2 id="contents-sysvinit"><title>Contents of Sysvinit</title> - -<para><emphasis>Installed programs</emphasis>: halt, init, killall5, last, -lastb (link to last), mesg, pidof (link to killall5), poweroff (link to halt), -reboot (link to halt), runlevel, shutdown, sulogin, telinit (link to init), -utmpdump and wall</para> - -</sect2> +<sect2 id="contents-sysvinit" role="content"><title>Contents of Sysvinit</title> +<segmentedlist> +<segtitle>Installed programs</segtitle> +<seglistitem><seg>halt, init, killall5, last, lastb (link to last), mesg, pidof (link to +killall5), poweroff (link to halt), reboot (link to halt), runlevel, shutdown, sulogin, telinit +(link to init), utmpdump and wall</seg></seglistitem> +</segmentedlist> -<sect2><title>Short descriptions</title> +<variablelist><title>Short descriptions</title> +<varlistentry> +<term id="halt"><command>halt</command></term> +<listitem> <indexterm zone="ch-system-sysvinit halt"><primary sortas="b-halt">halt</primary></indexterm> -<para id="halt"><command>halt</command> normally invokes shutdown with the -h flag, +<para>normally invokes shutdown with the -h flag, except when already in run-level 0, then it tells the kernel to halt the system. But first it notes in the file <filename>/var/log/wtmp</filename> that the system is being brought down.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="init"><command>init</command></term> +<listitem> <indexterm zone="ch-system-sysvinit init"><primary sortas="b-init">init</primary></indexterm> -<para id="init"><command>init</command> is the mother of all processes. It reads its +<para>is the mother of all processes. It reads its commands from <filename>/etc/inittab</filename>, which normally tell it which scripts to run for which run-level, and how many gettys to spawn.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="killall5"><command>killall5</command></term> +<listitem> <indexterm zone="ch-system-sysvinit killall5"><primary sortas="b-killall5">killall5</primary></indexterm> -<para id="killall5"><command>killall5</command> sends a signal to all processes, except -the processes in its own session -- so it won't kill the shell running the -script that called it.</para> - +<para>sends a signal to all processes, except the processes in its own session -- +so it won't kill the shell running the script that called it.</para> +</listitem> +</varlistentry> + +<varlistentry> +<term id="last"><command>last</command></term> +<listitem> <indexterm zone="ch-system-sysvinit last"><primary sortas="b-last">last</primary></indexterm> -<para id="last"><command>last</command> shows which users last logged in (and out), +<para>shows which users last logged in (and out), searching back through the file <filename>/var/log/wtmp</filename>. It can also show system boots and shutdowns, and run-level changes.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="lastb"><command>lastb</command></term> +<listitem> <indexterm zone="ch-system-sysvinit lastb"><primary sortas="b-lastb">lastb</primary></indexterm> -<para id="lastb"><command>lastb</command> shows the failed login attempts, as logged -in <filename>/var/log/btmp</filename>.</para> - +<para>shows the failed login attempts, as logged in +<filename>/var/log/btmp</filename>.</para> +</listitem> +</varlistentry> + +<varlistentry> +<term id="mesg"><command>mesg</command></term> +<listitem> <indexterm zone="ch-system-sysvinit mesg"><primary sortas="b-mesg">mesg</primary></indexterm> -<para id="mesg"><command>mesg</command> controls whether other users can send +<para>controls whether other users can send messages to the current user's terminal.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="pidof"><command>pidof</command></term> +<listitem> <indexterm zone="ch-system-sysvinit pidof"><primary sortas="b-pidof">pidof</primary></indexterm> -<para id="pidof"><command>pidof</command> reports the PIDs of the given programs.</para> +<para>reports the PIDs of the given programs.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="poweroff"><command>poweroff</command></term> +<listitem> <indexterm zone="ch-system-sysvinit poweroff"><primary sortas="b-poweroff">poweroff</primary></indexterm> -<para id="poweroff"><command>poweroff</command> tells the kernel to halt the system and +<para>tells the kernel to halt the system and switch off the computer. But see halt.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="reboot"><command>reboot</command></term> +<listitem> <indexterm zone="ch-system-sysvinit reboot"><primary sortas="b-reboot">reboot</primary></indexterm> -<para id="reboot"><command>reboot</command> tells the kernel to reboot the system. -But see halt.</para> +<para>tells the kernel to reboot the system. But see halt.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="runlevel"><command>runlevel</command></term> +<listitem> <indexterm zone="ch-system-sysvinit runlevel"><primary sortas="b-runlevel">runlevel</primary></indexterm> -<para id="runlevel"><command>runlevel</command> reports the previous and the current -run-level, as noted in the last run-level record in -<filename>/var/run/utmp</filename>.</para> - +<para>reports the previous and the current run-level, as noted in the last run-level +record in <filename>/var/run/utmp</filename>.</para> +</listitem> +</varlistentry> + +<varlistentry> +<term id="shutdown"><command>shutdown</command></term> +<listitem> <indexterm zone="ch-system-sysvinit shutdown"><primary sortas="b-shutdown">shutdown</primary></indexterm> -<para id="shutdown"><command>shutdown</command> brings the system down in a secure way, +<para>brings the system down in a secure way, signaling all processes and notifying all logged-in users.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="sulogin"><command>sulogin</command></term> +<listitem> <indexterm zone="ch-system-sysvinit sulogin"><primary sortas="b-sulogin">sulogin</primary></indexterm> -<para id="sulogin"><command>sulogin</command> allows the superuser to log in. It is +<para>allows the superuser to log in. It is normally invoked by init when the system goes into single user mode.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="telinit"><command>telinit</command></term> +<listitem> <indexterm zone="ch-system-sysvinit telinit"><primary sortas="b-telinit">telinit</primary></indexterm> -<para id="telinit"><command>telinit</command> tells init which run-level to enter.</para> +<para>tells init which run-level to enter.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="utmpdump"><command>utmpdump</command></term> +<listitem> <indexterm zone="ch-system-sysvinit utmpdump"><primary sortas="b-utmpdump">utmpdump</primary></indexterm> -<para id="utmpdump"><command>utmpdump</command> displays the content of the given login -file in a friendlier format.</para> +<para>displays the content of the given login file in a friendlier format.</para> +</listitem> +</varlistentry> +<varlistentry> +<term id="wall"><command>wall</command></term> +<listitem> <indexterm zone="ch-system-sysvinit wall"><primary sortas="b-wall">wall</primary></indexterm> -<para id="wall"><command>wall</command> writes a message to all logged-in users.</para> +<para>writes a message to all logged-in users.</para> +</listitem> +</varlistentry> +</variablelist> </sect2> - - </sect1> |