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