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Tag Archives: bash

Limit number of instances of a specific process and user

22-Jul-10

I’m using this to limit the number of processes that Ampache spawns. Sometimes, it goes hay-wire. #!/bin/sh cmd="$1" lim="$2" user="$3" || "www" numprocs=`ps -U www | grep "$cmd" | wc -l` echo "Found $numprocs comparing to $lim" if [ "$numprocs" -gt "$lim" ]; then         echo "found $numprocs processes"       [...]

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Using Linux command lockfile in bash scripts

14-Jul-10

I needed to create a script that runs a regression test. I intended to schedule this with a cron job. However, I found that sometimes, my cron jobs would collide with each other. So, I looked to Linux’ lockfile command to create a file lock as a semaphore. Here’s the incantation: # if we’re already [...]

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