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Full Discussion: How to add conditional check of whether a process is running before doing rest of script?
Top Forums Shell Programming and Scripting How to add conditional check of whether a process is running before doing rest of script? Post 302854091 by Corona688 on Monday 16th of September 2013 05:49:05 PM
Old 09-16-2013
That's why you save it in a PID file, so you know what to check.

Code:
#!/bin/bash

if [ -f /tmp/overviewer.pid ] && read PID < /tmp/overviewer.pid && ps "$PID" >/dev/null 2>/dev/null
then
        echo "Overviewer already running as PID $PID" >&2
        exit 1
fi

# Automatically delete PID file on exit
trap "rm /tmp/overviewer.pid" EXIT

# Automatically append stdout to this file
exec 1>>/home/mcmaps/scripts/overviewer.log

echo Overviewer Starting...
date
echo -------------------------

# Run this in the background with &
overviewer.py --verbose --quiet --processes 1 --config=/home/mcmaps/servers/bukkitpvt/overviewer.conf &

echo "$!" > /tmp/overviewer.pid

wait

echo -------------------------
echo Overviewer Complete
echo ============================================

Last edited by Corona688; 09-16-2013 at 07:05 PM..
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT DEBIAN

msvc

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

NAME

       msvc - control minit

SYNOPSIS

       msvc [ -[uodpchaitko] ] [ -P pid ] service [...]

DESCRIPTION

       msvc  is the management interface to minit.  service is the service directory name relative to /etc/minit.  Starting with minit 0.9 you can
       also include /etc/minit/ in the service name.

OPTIONS

       If no option is given, msvc will just print a small diagnostic message to stdout, saying if the service is up, down or finished, which  PID
       it has if it is up, and for how long it has been in this state.

       -u   Up.  If the service is not running, start it.  If the service stops, restart it.

       -o   Once.  If the service is not running, start it.  If the service stops, do not restart it.

       -d   Down.  If the service is running, send it a TERM signal and then a CONT signal.  After it stops, do not restart it.

       -p   Pause.  Send the service a STOP signal.

       -c   Continue.  Send the service a CONT signal.

       -h   Hangup.  Send the service a HUP signal.

       -a   Alarm.  Send the service an ALRM signal.

       -i   Interrupt.	Send the service an INT signal.

       -t   Terminate.	Send the service a TERM signal.

       -k   Terminate.	Send the service a KILL signal.

       -P pid
	    Set PID.  Tell minit the PID of the service is really pid.	This is useful for services that fork themselves in the background but put
	    their real PID in a file, typically called /var/run/service.pid.  Used by pidfilehack.

       -D service
	    Print dependencies.  This will print all the names of all the services that were started  because  this  services  depended  on  them.
	    Please  note  that this is not done recursively (i.e. if default depends on qmail and qmail depends on log, this will print qmail, not
	    qmail/log.	But msvc -D qmail will print qmail/log).

       -H   Print history.  This will print the names of the ten least recently spawned processes.  This is useful if you see  a  process  looping
	    (initialization fails and minit is restarting it all the time).

RETURN CODES

       Generally,  msvc  return zero if everything is OK or 1 on error (could not open /lib/minit/in or /lib/minit/out or there is no process with
       the given name).  In diagnostic mode, it will exit 0 if the service is up, 2 if it is down or 3 if it is finished.

SEE ALSO

       pidfilehack(8), svc(8)

																	   msvc(8)
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