Start Stop Restart

Shell Programming and Scripting
1

I'm wondering how I should make a script that can start, stop, and restart another script.
What I need to be able to do, is start and stop a perl script from the command line. The easiest way of doing this seems to be to have another script, starting and stopping the other script. I have BASH, DASH, KSH, PERL installed.
Does anyone have any ideas?

2

have a look at the runlevel scripts in /etc/init.d; /etc/rcx.d (depends on your os!). these scripts are doing exactly what you want to do...

3

well, I don't even have those, since i have ubuntu. I think its init.d in ubuntu. I'll try and find a simple one.

4

Ok, i'm really confused.
I just haven't spent enough time scripting to be able to do complex tasks.
I don't want to ask too much of you, but let's say I want it to control the script
/home/bakes/control.sh ?
does anyone feel like making an example for me?

5

there are runlevel scripts in ubuntu... but i've only an old version to look at (6.06). i've posted you the crond start/stop script.

#!/bin/sh
# Start/stop the cron daemon.
#
### BEGIN INIT INFO
# Provides:          cron
# Required-Start:    $syslog $time
# Required-Stop:     $syslog $time
# Default-Start:     2 3 4 5
# Default-Stop:      S 0 1 6
# Short-Description: Regular background program processing daemon
# Description:       cron is a standard UNIX program that runs user-specified 
#                    programs at periodic scheduled times. vixie cron adds a 
#                    number of features to the basic UNIX cron, including better
#                    security and more powerful configuration options.

### END INIT INFO


test -f /usr/sbin/cron || exit 0

#LSBNAMES='-l'  # Uncomment for LSB name support in /etc/cron.d/

. /lib/lsb/init-functions

case "$1" in
start)	log_begin_msg "Starting periodic command scheduler..."
        start-stop-daemon --start --quiet --pidfile /var/run/crond.pid --name cr
on --startas /usr/sbin/cron -- $LSBNAMES
        log_end_msg $?
	;;
stop)	log_begin_msg "Stopping periodic command scheduler..."
        start-stop-daemon --stop --quiet --pidfile /var/run/crond.pid --name cro
n
        log_end_msg $?
        ;;
restart) log_begin_msg "Restarting periodic command scheduler..."
        start-stop-daemon --stop --retry 5 --quiet --pidfile /var/run/crond.pid 
--name cron
        start-stop-daemon --start --quiet --pidfile /var/run/crond.pid --name cr
on --startas /usr/sbin/cron -- $LSBNAMES
        log_end_msg $?
        ;;
reload|force-reload) log_begin_msg "Reloading configuration files for periodic c
ommand scheduler..."
	# cron reloads automatically
        log_end_msg 0
        ;;
*)	log_success_msg "Usage: /etc/init.d/cron start|stop|restart|reload|force
-reload"
        exit 1 
        ;;
esac
exit 0
6

at least that one's smaller than the apache one i was looking at!

7

I can honestly make no sense of that, I'm dyslexic and unless it's laid out really well, I just find it semi-impossible. As well as that, i'm not entirely sure what this does, other than calling start-stop-daemon to kill/start the process

8

ok, i've got my script going. Thanks for the help!