Lock

This program creates a lock directory to ensure two programs do no simulaneously execute

example GIF:

example text:

calvin@barnabas:~/lock$ lock p
calvin@barnabas:~/lock$ lock p && echo 'UNLOCKED' &
[2] 22844
calvin@barnabas:~/lock$ rmdir p
* two seconds later *
calvin@barnabas:~/lock$ 
UNLOCKED
[2]-  Done                    lock p && echo -e '\nUNLOCKED\n'
calvin@barnabas:~/lock$