prevent users to run the same script at the same time, on the same machine

[pvpnguyen]

Hello All,

Is there any way to prevent users to run the same script at the same time, on the same machine?

Thanks

[pavlo_7]

Try using locks. Create lock file before running the script and remove the lock after it finishes. And create condition (in the script) so that script cannot run if there is a lock.

[vsemaska]

If you use a lock file you should put in the script to trap a ^C to abort. Otherwise you'll have the lock file left behind and you'll have to manually delete the file before anyone can run the script again. Here's a crude example:

#!/bin/ksh -vx

lkfle="/root/test.lk"
if [ -e $lkfle ]
   then echo "Someone else is running the script"
        exit
   fi

abort_it () {
echo "Aborting"
if [ -e $lkfle ]; then rm -fv $lkfle; fi
exit
}

trap abort_it INT

touch $lkfle
sleep 6
rm -fv $lkfle

[pvpnguyen]

Thank you very much, you guys are my life savers.