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Full Discussion: Bash As System Script
Top Forums Shell Programming and Scripting Bash As System Script Post 302442466 by fpmurphy on Wednesday 4th of August 2010 09:55:05 AM
Old 08-04-2010
First of all init.d scripts have a fairly specific format if you want the script to play well with the operating system. Here is an outline of the format. Look at other files in init.d to get a fuller understanding.
Code:
#! /bin/sh
#
# name of script
#
### BEGIN INIT INFO
# Provides: 
# Required-Start:
# Required-Stop:
# Default-Start: 2
# Default-Stop:
# Description: 
### END INIT INFO

. /etc/rc.status

rc_reset

case "$1" in
start)
    your code to start service
;;
stop)
    your code to stop service
;;
restart)
stop;
start;
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
;;
esac
rc_exit

Next, you need to decide what run level your init script is started at and what run level your init script is stopped at. They may be different.

I suggest you start your script at runlevel 2. This means that you need symbolic link from your init.d script to a file named SxxYourScriptName in the rc2.d directory.
 

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LEARN ABOUT ULTRIX

service

SERVICE(8)						      System Manager's Manual							SERVICE(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service	runs  a System V init script or systemd unit in as predictable an environment as possible, removing most environment variables and
       with the current working directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT, or the name of a systemd unit.  The  existence  of  a
       systemd unit of the same name as a script in /etc/init.d will cause the unit to take precedence over the init.d script.	The supported val-
       ues of COMMAND depend on the invoked script. service passes COMMAND  and OPTIONS to the init script unmodified. For systemd  units,  start,
       stop, status, and reload are passed through to their systemctl/initctl equivalents.

       All scripts should support at least the start and stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice,
       first with the stop command, then with the start command.

       service --status-all runs all init scripts, in alphabetical order, with the status command. The status is [ + ] for running services, [ - ]
       for stopped services and [ ? ] for services without a status command.  This option only calls status for sysvinit jobs.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

       /{lib,run,etc}/systemd/system
	      The directories containing systemd units.

ENVIRONMENT

       LANG,  LANGUAGE,  LC_CTYPE, LC_NUMERIC, LC_TIME, LC_COLLATE, LC_MONETARY, LC_MESSAGES, LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEA-
       SUREMENT, LC_IDENTIFICATION, LC_ALL, TERM, PATH
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton
       update-rc.d(8)
       init(8)
       invoke-rc.d(8)
       systemctl(1)

AUTHOR

       Miloslav Trmac <mitr@redhat.com>, Petter Reinholdtsen <pere@hungry.com>

       Licence: GNU Public Licence v2 (GPLv2)

COPYRIGHT

       2006 Red Hat, Inc.,  Petter Reinholdtsen <pere@hungry.com>

Jan 206 																SERVICE(8)
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