bash flock

#!/bin/bash 

{

flock -xn 3 

if [ $? -ne 0 ];then

echo "Aready runing..."

exit 1

fi

do some thing here

} 3<>/tmp/`basename $0`.lock

或============================

lockit () {

        if [[ $(dirname $0) == "." ]];then

                lock=.${0}.lock

        else

                lock=$(dirname $0)/.$(basename $0).lock

        fi

        exec 7<>$lock

        flock -xn 7 || {

                echo "Waiting for lock {$lock} to release..."

                #flock 7

                exit 1

        }

}

lockit