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 | 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$ 
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