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Configuration of System V init under Debian GNU/Linux
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Most Unix versions have a file here that describes how the scripts
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in this directory work, and how the links in the /etc/rc?.d/ directories
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influence system startup/shutdown.
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For Debian, this information is contained in the policy manual, chapter
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"System run levels and init.d scripts". The Debian Policy Manual is
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available at:
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http://www.debian.org/doc/debian-policy/#contents
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The Debian Policy Manual is also available in the Debian package
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"debian-policy". When this package is installed, the policy manual can be
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found in directory /usr/share/doc/debian-policy. If you have a browser
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installed you can probably read it at
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file://localhost/usr/share/doc/debian-policy/
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Some more detailed information can also be found in the files in the
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/usr/share/doc/sysv-rc directory.
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Debian Policy dictates that /etc/init.d/*.sh scripts must work properly
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when sourced. The following additional rules apply:
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* /etc/init.d/*.sh scripts must not rely for their correct functioning
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on their being sourced rather than executed. That is, they must work
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properly when executed too. They must include "#!/bin/sh" at the top.
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This is useful when running scripts in parallel.
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* /etc/init.d/*.sh scripts must conform to the rules for sh scripts as
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spelled out in the Debian policy section entitled "Scripts" (§10.4).
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Use the update-rc.d command to create symbolic links in the /etc/rc?.d
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as appropriate. See that man page for more details.
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All init.d scripts are expected to have a LSB style header documenting
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dependencies and default runlevel settings. The header look like this
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(not all fields are required):
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### BEGIN INIT INFO
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# Provides: skeleton
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# Required-Start: $remote_fs $syslog
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# Required-Stop: $remote_fs $syslog
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# Should-Start: $portmap
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# Should-Stop: $portmap
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# X-Start-Before: nis
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# X-Stop-After: nis
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# Default-Start: 2 3 4 5
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# Default-Stop: 0 1 6
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# X-Interactive: true
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# Short-Description: Example initscript
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# Description: This file should be used to construct scripts to be
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# placed in /etc/init.d.
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### END INIT INFO
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More information on the format is available from insserv(8). This
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information is used to dynamicaly assign sequence numbers to the
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boot scripts and to run the scripts in parallel during the boot.
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See also /usr/share/doc/insserv/README.Debian.
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