[8fcc2c0] | 1 | <sect2><title>Contents of Sysvinit</title>
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| 2 |
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| 3 | <para>Last checked against version &sysvinit-contversion;.</para>
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[6370fa6] | 4 |
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[bdc08c1] | 5 | <sect3><title>Program Files</title>
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| 6 | <para>halt, init, killall5, last, lastb (link to last), mesg, pidof
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| 7 | (link to killall5), poweroff (link to halt), reboot (link to halt),
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| 8 | runlevel, shutdown, sulogin, telinit (link to init), utmpdump and
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| 9 | wall</para></sect3>
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[6370fa6] | 10 |
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[bdc08c1] | 11 | <sect3><title>Descriptions</title>
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[6370fa6] | 12 |
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[bdc08c1] | 13 | <sect4><title>halt</title>
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[6a9875d] | 14 | <para>halt notes, in the file /var/log/wtmp, that the system is being
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| 15 | brought down and then tells the kernel to either halt, reboot or
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[6370fa6] | 16 | poweroff the system. If halt or reboot is called when the system is not
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[b822811] | 17 | in runlevel 0 or 6, shutdown will be invoked instead (with
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[bdc08c1] | 18 | the flag -h or -r).</para></sect4>
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[6370fa6] | 19 |
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[bdc08c1] | 20 | <sect4><title>init</title>
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| 21 | <para>init is the parent of all processes. Its primary role is to create
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[2c094d6] | 22 | processes from a script stored in the file /etc/inittab. This
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[6a9875d] | 23 | file usually has entries which cause init to spawn gettys on each line from
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| 24 | which users can log in. It also controls autonomous processes required by any
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[bdc08c1] | 25 | particular system.</para></sect4>
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[6370fa6] | 26 |
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[bdc08c1] | 27 | <sect4><title>killall5</title>
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[b822811] | 28 | <para>killall5 is the SystemV killall command. It sends a signal to all
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[6370fa6] | 29 | processes except the processes in its own session, so it won't kill the
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[bdc08c1] | 30 | shell that is running the script it was called from.</para></sect4>
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[6370fa6] | 31 |
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[bdc08c1] | 32 | <sect4><title>last</title>
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[53ad30a] | 33 | <para>last searches back through the file /var/log/wtmp (or the file designated
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[2c094d6] | 34 | by the -f flag) and displays a list of all users logged in (and out)
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[bdc08c1] | 35 | since that file was created.</para></sect4>
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[6370fa6] | 36 |
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[bdc08c1] | 37 | <sect4><title>lastb</title>
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[53ad30a] | 38 | <para>lastb is the same as last, except that by default it shows a log of the
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[bdc08c1] | 39 | file /var/log/btmp, which contains all the bad login attempts.</para></sect4>
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[6370fa6] | 40 |
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[bdc08c1] | 41 | <sect4><title>mesg</title>
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[cf24ff1] | 42 | <para>mesg controls the access to the user's terminal by others. It's typically
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[bdc08c1] | 43 | used to allow or disallow other users to write to his terminal.</para></sect4>
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[6370fa6] | 44 |
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[bdc08c1] | 45 | <sect4><title>pidof</title>
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[159c2d2] | 46 | <para>pidof displays the process identifiers (PIDs) of the named
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| 47 | programs.</para></sect4>
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[6370fa6] | 48 |
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[bdc08c1] | 49 | <sect4><title>poweroff</title>
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[53ad30a] | 50 | <para>poweroff is equivalent to shutdown -h -p now. It halts the computer and
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| 51 | switches off the computer (when using an APM compliant BIOS and APM is
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[bdc08c1] | 52 | enabled in the kernel).</para></sect4>
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[6370fa6] | 53 |
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[bdc08c1] | 54 | <sect4><title>reboot</title>
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[53ad30a] | 55 | <para>reboot is equivalent to shutdown -r now. It reboots
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[bdc08c1] | 56 | the computer.</para></sect4>
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[6370fa6] | 57 |
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[bdc08c1] | 58 | <sect4><title>runlevel</title>
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[6a9875d] | 59 | <para>runlevel reads the system utmp file (usually /var/run/utmp), locates
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| 60 | the runlevel record and prints the previous and current system
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[2c094d6] | 61 | runlevel on its standard output, separated by a single space.</para></sect4>
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[6370fa6] | 62 |
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[bdc08c1] | 63 | <sect4><title>shutdown</title>
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[b822811] | 64 | <para>shutdown brings the system down in a secure way. All logged-in users are
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[6a9875d] | 65 | notified that the system is going down and login is blocked.</para></sect4>
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[6370fa6] | 66 |
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[bdc08c1] | 67 | <sect4><title>sulogin</title>
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[b822811] | 68 | <para>sulogin is invoked by init when the system goes into single user mode
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[6370fa6] | 69 | (this is done through an entry in /etc/inittab). Init also tries to
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[b822811] | 70 | execute sulogin when it is passed the -b flag from the boot loader
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[a2cd10f] | 71 | (LILO, for example).</para></sect4>
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[6370fa6] | 72 |
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[bdc08c1] | 73 | <sect4><title>telinit</title>
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[b822811] | 74 | <para>telinit sends appropriate signals to init, telling it which runlevel to
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[6a9875d] | 75 | enter.</para></sect4>
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[53ad30a] | 76 |
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[bdc08c1] | 77 | <sect4><title>utmpdump</title>
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[53ad30a] | 78 | <para>utmpdumps prints the content of a file (usually /var/run/utmp) on
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[bdc08c1] | 79 | standard output in a user friendly format.</para></sect4>
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| 80 |
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| 81 | <sect4><title>wall</title>
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[6a9875d] | 82 | <para>wall sends a message to logged in users that have their mesg permission
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[bdc08c1] | 83 | set to yes.</para></sect4>
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[6370fa6] | 84 |
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[bdc08c1] | 85 | </sect3>
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[6370fa6] | 86 |
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| 87 | </sect2>
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| 88 |
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