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diff --git a/appendixa/sysvinit-desc.sgml b/appendixa/sysvinit-desc.sgml new file mode 100644 index 000000000..4f8603ab2 --- /dev/null +++ b/appendixa/sysvinit-desc.sgml @@ -0,0 +1,160 @@ +<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> + |