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darth-veitcher/bash-pid.md

Created January 8, 2017 22:13
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  1. darth-veitcher created this gist Jan 8, 2017.
    42 changes: 42 additions & 0 deletions bash-pid.md
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    Pattern below allows for a bash script to be called via, say, cron and check to see if it is already running.

    Useful for things like `rsync` tasks.

    ```bash
    PIDFILE=/var/run/myscriptname.pid

    if [ -f $PIDFILE ]
    then
    PID=$(cat $PIDFILE)
    ps -p $PID > /dev/null 2>&1
    if [ $? -eq 0 ]
    then
    echo "Process already running"
    exit 1
    else
    ## Process not found assume not running
    echo $$ > $PIDFILE
    if [ $? -ne 0 ]
    then
    echo "Could not create PID file"
    exit 1
    fi
    fi
    else
    echo $$ > $PIDFILE
    if [ $? -ne 0 ]
    then
    echo "Could not create PID file"
    exit 1
    fi
    fi


    # Main script ... Do work here

    ...

    # End

    rm $PIDFILE
    ```