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