防止shell脚本被重复执行
1 #!/bin/bash 2 LOCK_NAME="/tmp/my.lock" 3 if ( set -o noclobber; echo "$$" > "$LOCK_NAME") 2> /dev/null; 4 then 5 trap 'rm -f "$LOCK_NAME"; exit $?' INT TERM EXIT 6 7 ### 开始正常流程 8 9 sh /app/system.sh 10 sleep 30 11 ### 正常流程结束 12 13 ### Removing lock 14 rm -f $LOCK_NAME 15 trap - INT TERM EXIT 16 else 17 echo "Failed to acquire lockfile: $LOCK_NAME." 18 echo "Held by $(cat $LOCK_NAME)" 19 exit 1 20 fi 21 echo "Done." 22
