1lckdo(1)                    General Commands Manual                   lckdo(1)
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NAME

6       lckdo - run a program with a lock held
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SYNOPSIS

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

12       lckdo  runs  a  program  with a lock held, in order to prevent multiple
13       processes from running in parallel. Use just like nice or nohup.
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OPTIONS

16       -w     If the lock is already held by another process, wait for  it  to
17              complete instead of failing immediately.
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19       -W {sec}
20              The same as -w but wait not more than sec seconds.
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22       -e     Execute  the program directly without forking and waiting (keeps
23              an extra file descriptor open).
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25       -E {nnn}
26              Set the file descriptor number to keep open when exec()ing  (im‐
27              plies -e).
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29       -n     Do not create the lock file if it does not exist.
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31       -q     Produce no output if lock is already held.
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33       -s     Lock in shared (read) mode.
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35       -x     Lock in exclusive (write) mode (default).
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37       -t     Test for lock existence.
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EXIT STATUS

40       If  the lock was successfully acquired, the return value is that of the
41       program invoked by lckdo. If the lock couldn't be acquired, EX_TEMPFAIL
42       is  returned.  If  there  was a problem opening/creating or locking the
43       lock file, EX_CANTCREAT or EX_OSERR will be returned.
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47                                  2007-08-15                          lckdo(1)