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authorGerard Beekmans <gerard@linuxfromscratch.org>2001-02-15 15:26:52 +0000
committerGerard Beekmans <gerard@linuxfromscratch.org>2001-02-15 15:26:52 +0000
commitb08f4096533577934b885fa9df41d3881d141612 (patch)
tree8e5ffc0ba65ac34d97cd6a896d33b85a897a6da8 /appendixa/sysvinit-desc.xml
parentad08014624938a3a3bfd1b44e8b27d02c7b06dd8 (diff)
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+<sect2>
+<title>Contents</title>
+
+<para>
+The Sysvinit package contains the pidof, last, lastb, mesg, utmpdump,
+wall, halt, init, killall5, poweroff, reboot, runlevel, shutdown,
+sulogin and telinit programs.
+</para>
+
+</sect2>
+
+<sect2><title>Description</title>
+
+<sect3><title>pidof</title>
+
+<para>
+Pidof finds the process id's (pids) of the named programs and prints
+those id's on standard output.
+</para>
+
+</sect3>
+
+<sect3><title>last</title>
+
+<para>
+last searches back through the file /var/log/wtmp (or the file designated
+by the -f flag) and displays a list of all users logged in (and out)
+since that file was created.
+</para>
+
+</sect3>
+
+<sect3><title>lastb</title>
+
+<para>
+lastb is the same as last, except that by default it shows a log of the
+file /var/log/btmp, which contains all the bad login attempts.
+
+</para>
+
+</sect3>
+
+<sect3><title>mesg</title>
+
+<para>
+Mesg controls the access to your terminal by others. It's typically
+used to allow or disallow other users to write to your terminal.
+</para>
+
+</sect3>
+
+<sect3><title>utmpdump</title>
+
+<para>
+utmpdumps prints the content of a file (usually /var/run/utmp) on
+standard output in a user friendly format.
+</para>
+
+</sect3>
+
+<sect3><title>wall</title>
+
+<para>
+Wall sends a message to everybody logged in with their mesg permission
+set to yes.
+</para>
+
+</sect3>
+
+<sect3><title>halt</title>
+
+<para>
+Halt notes that the system is being brought down in the file
+/var/log/wtmp, and then either tells the kernel to halt, reboot or
+poweroff the system. If halt or reboot is called when the system is not
+in runlevel 0 or 6, shutdown will be invoked instead (with the flag -h or -r).
+</para>
+
+</sect3>
+
+<sect3><title>init</title>
+
+<para>
+Init is the parent of all processes. Its primary role is to create
+processes from a script stored in the file /etc/inittab. This
+file usually has entries which cause init to spawn gettys on each line that
+users can log in. It also controls autonomous processes required by any
+particular system.
+</para>
+
+</sect3>
+
+<sect3><title>killall5</title>
+
+<para>
+killall5 is the SystemV killall command. It sends a signal to all
+processes except the processes in its own session, so it won't kill the
+shell that is running the script it was called from.
+</para>
+
+</sect3>
+
+<sect3><title>poweroff</title>
+
+<para>
+poweroff is equivalent to shutdown -h -p now. It halts the computer and
+switches off the computer (when using an APM compliant BIOS and APM is
+enabled in the kernel).
+</para>
+
+</sect3>
+
+<sect3><title>reboot</title>
+
+<para>
+reboot is equivalent to shutdown -r now. It reboots the computer.
+</para>
+
+</sect3>
+
+<sect3><title>runlevel</title>
+
+<para>
+Runlevel reads the system utmp file (typically /var/run/utmp) to locate
+the runlevel record, and then prints the previous and current system
+runlevel on its standard output, separated by a single space.
+</para>
+
+</sect3>
+
+<sect3><title>shutdown</title>
+
+<para>
+shutdown brings the system down in a secure way. All logged-in users are
+notified that the system is going down, and login is blocked.
+</para>
+
+</sect3>
+
+<sect3><title>sulogin</title>
+
+<para>
+sulogin is invoked by init when the system goes into single user mode
+(this is done through an entry in /etc/inittab). Init also tries to
+execute sulogin when it is passed the -b flag from the bootmonitor (eg, LILO).
+</para>
+
+</sect3>
+
+<sect3><title>telinit</title>
+
+<para>
+telinit sends appropriate signals to init, telling it which runlevel to
+change to.
+</para>
+
+</sect3>
+
+</sect2>
+