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<!Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<TITLE>4.10.1 System startup files</TITLE>
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<H2><A NAME=SECTION006101000000000000000>4.10.1 System startup files</A></H2>
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When the system boots, a number of scripts are executed automatically
by the system before any user logs in. Here is a description of what
happens.
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At bootup time, the kernel spawns the process <tt>/etc/init</tt>.
<tt>init</tt> is a program which reads its configuration file,
<tt>/etc/inittab</tt>, and spawns other processes based on the contents of
this file. One of the important processes started from <tt>inittab</tt>
is the <tt>/etc/getty</tt> process started on each virtual console.
The <tt>getty</tt> process grabs the VC for use, and starts a <tt>login</tt>
process on the VC. This allows you to login on each VC; if
<tt>/etc/inittab</tt> does not contain a <tt>getty</tt> process for a certain
VC, you will not be able to login on that VC.
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Another process executed from <tt>/etc/inittab</tt> is <tt>/etc/rc</tt>,
the main system initialization file. This file is a simple shell
script which executes any initialization commands needed at boot time,
such as mounting the filesystems (see Section <A HREF="node184.html#secmanagefs">4.8</A>) and
initializing swap space.
<P>
Your system may execute other initialization scripts as well, such as
<tt>/etc/rc.local</tt>. <tt>/etc/rc.local</tt> usually contains initialization
commands specific to your own system, such as setting the hostname (see
the next section). <tt>rc.local</tt> may be started from <tt>/etc/rc</tt>
or from <tt>/etc/inittab</tt> directly.
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<P><ADDRESS>
<I>Matt Welsh <BR>
mdw@sunsite.unc.edu</I>
</ADDRESS>
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