ref: 13963cd5e032bf85f0d2f9a562b263374a7cc850
dir: /sys/man/1/lock/
.TH LOCK 1 .SH NAME lock \- run a command under lock .SH SYNOPSIS .B lock [ .B -w ] .I lockfile [ .I command [ .I argument \&... ] ] .SH DESCRIPTION .I Lock runs .I command (default .LR rc ) with .I arguments while holding .I lockfile open and (over)writing at least one byte each minute to keep the exclusive-access lock alive. If .I lockfile doesn't already have the exclusive-access bit set in its mode, the exclusive-access bits are set in its mode and .BR qid.type . .PP Under .BR -w , .I lock waits for exclusive access to .I lockfile instead of just trying once. .PP .I Lock sets .B /env/prompt to contain the name of the lock file. .SH EXAMPLES Build a .IR replica (1) database while preventing collisions with other occurrences. .IP .EX cd /sys/lib/dist lock scan.lock replica/scan $dist/sources.replica .EE .SH SOURCE .B /sys/src/cmd/lock.c .SH SEE ALSO .IR intro (5), .IR stat (5) .\" .SH DIAGNOSTICS .\" .SH BUGS