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lckdo - Online in the Cloud

Run lckdo in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command lckdo that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

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.

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