Check if process is running

[kerstenk]

Hi guys,

i need help with a script.

#!/bin/bash

# This process id
pid=$$

# Path to the file which contains the process id
path="/var/tmp/"
# File which contains the process id
file="accumRunning"

pname="accumData"

# Command for checking and running
cmd="php /home/kersten/workspace/AdBenchImporter/import.php"

# check if file exists
if [ -s $path$file ]; then
        # Process id of the running command
        oldpid=`cat $path$file`

        # gets the parent id for the running script
        parent=`/bin/ps -lp $oldpid | tail -1 | tr -s ' ' | cut -c30- | cut -d' ' -f5;`

        # Checks if the current parent id matches the parent id of the running command
        if [ $parent = $pname ]; then
                echo "running"
        else
                `rm $path$file`
                `echo $pid > $path$file`
                `$cmd`
        fi
else
        # writing the current proccess id in the file
        `echo $pid > $path$file`

        # Start the command
        `$cmd`
fi

exit 0

Above you can see my script. This is working very well if i start it in a console. It starts the process if it is not running and gives the answer that it is running if it finds the process id with the given pname.

Now i want to start it from a php script but it wont work. the process is started but the script gives me the wrong answer and it starts again.

Thanks for the help.

Kersten

[Sturm]

a better way to check if the process is running is:

if ! ps -C <yourprocesshere> > /dev/null
then
#...
fi