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
- FC-wF[0]
-
If the lock is already held by another process, wait for it to complete instead of failing immediately.
- FC-W {sec}F[0]
-
The same as -w but wait not more than sec seconds.
- FC-eF[0]
-
Execute the program directly without forking and waiting (keeps an extra file descriptor open).
- FC-E {nnn}F[0]
-
Set the file descriptor number to keep open when exec()ing (implies -e).
- FC-nF[0]
-
Do not create the lock file if it does not exist.
- FC-qF[0]
-
Produce no output if lock is already held.
- FC-sF[0]
-
Lock in shared (read) mode.
- FC-xF[0]
-
Lock in exclusive (write) mode (default).
- FC-tF[0]
-
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