lckdo
lckdo
run a program with a lock held
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.

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.