An example of implementing linux shell file lock

An example of implementing linux shell filelock has recently seen many discussions about how to prevent repeated execution of scripts. It is actually the concept of filelock. I wrote a small example: starting with a file will not cause repeated execution. (I think the names of the two scripts are identical )#! /Bin/bashLockFile () {find/dev/shm/*-maxdepth 0-type l-follow-exec unlink {}\; [-f/dev/shm/$ {0 # */}] & exit ln-s/proc/$/dev/shm/$ {0 ##*/} trap "Exit" 0 1 2 3 15 22 24} Exit () {unlink/dev/shm/$ {0 # */}; exit 0;} LockFile # main program # program ...... # Exit set-Cif ($ (:>/tmp/lockfile) 2 <&-; then # run cmd rm-f/tmp/lockfilefiset + o noclobber