lock man page on Plan9

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LOCK(1)								       LOCK(1)

NAME
       lock - run a command under lock

SYNOPSIS
       lock [ -w ] lockfile [ command [ argument ...  ] ]

DESCRIPTION
       Lock  runs  command (default with arguments while holding lockfile open
       and (over)writing at least one byte each minute to keep the  exclusive-
       access  lock  alive.   If  lockfile doesn't already have the exclusive-
       access bit set in its mode, the exclusive-access bits are  set  in  its
       mode and qid.type.

       Under  -w,  lock waits for exclusive access to lockfile instead of just
       trying once.

       Lock sets /env/prompt to contain the name of the lock file.

EXAMPLES
       Build a replica(1) database  while  preventing  collisions  with	 other
       occurrences.

	      cd /sys/lib/dist
	      lock scan.lock replica/scan $dist/sources.replica

SOURCE
       /sys/src/cmd/lock.c

SEE ALSO
       intro(5), stat(5)

								       LOCK(1)
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