lock - run a command under lock lock [ -w ] lockfile [ command [ argument ... ] ] Lock runs command (default .LR rc ) 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.

Build a replica (1) database while preventing collisions with other occurrences. .EX cd /sys/lib/dist lock scan.lock replica/scan $dist/sources.replica /sys/src/cmd/lock.c intro (5), stat (5) .SH DIAGNOSTICS
.SH BUGS