lckdo (1)
Leading comments
Title: lckdo
Author: Michael Tokarev
Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
Date: 2007-08-15
Manual: moreutils
Source: moreutils
Language: English
NAME
lckdo - run a program with a lock heldSYNOPSIS
- lckdo [options] {lockfile} {program} [arguments]
DESCRIPTION
lckdo
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