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LCKDO(1)                           moreutils                          LCKDO(1)


NAME

       lckdo - run a program with a lock held


SYNOPSIS

       lckdo [options] {lockfile} {program} [arguments]


DESCRIPTION

       lckdo runs a program with a lock held, in order to prevent multiple
       processes from running in parallel. Use just like nice or nohup.

       Now that util-linux contains a similar command named flock, lckdo is
       deprecated, and will be removed from some future version of moreutils.


OPTIONS

       -w
           If the lock is already held by another process, wait for it to
           complete instead of failing immediately.

       -W {sec}
           The same as -w but wait not more than sec seconds.

       -e
           Execute the program directly without forking and waiting (keeps an
           extra file descriptor open).

       -E {nnn}
           Set the file descriptor number to keep open when exec()ing (implies
           -e).

       -n
           Do not create the lock file if it does not exist.

       -q
           Produce no output if lock is already held.

       -s
           Lock in shared (read) mode.

       -x
           Lock in exclusive (write) mode (default).

       -t
           Test for lock existence.


EXIT STATUS

       If the lock was successfully acquired, the return value is that of the
       program invoked by lckdo. If the lock couldn't be acquired, EX_TEMPFAIL
       is returned. If there was a problem opening/creating or locking the
       lock file, EX_CANTCREAT or EX_OSERR will be returned.


AUTHOR

       Michael Tokarev

moreutils                         2007-08-15                          LCKDO(1)

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