lckdo - Man Page

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tldr.sh

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

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​.

-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​.

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​.

Michael Tokarev