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Index: head/usr.bin/lockf/lockf.1
===================================================================
--- head/usr.bin/lockf/lockf.1
+++ head/usr.bin/lockf/lockf.1
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd July 7, 1998
+.Dd June 18, 2020
.Dt LOCKF 1
.Os
.Sh NAME
@@ -95,7 +95,8 @@
.Nm
to fail if the specified lock
.Ar file
-does not exist. If
+does not exist.
+If
.Fl n
is not specified,
.Nm
@@ -160,6 +161,25 @@
did not exit normally,
but may have been signaled or stopped.
.El
+.Sh EXAMPLES
+The first job takes a lock and sleeps for 5 seconds in the background.
+The second job tries to get the lock and timeouts after 1 second (PID numbers
+will differ):
+.Bd -literal -offset indent
+$ lockf mylock sleep 5 & lockf -t 1 mylock echo "Success"
+[1] 94410
+lockf: mylock: already locked
+.Ed
+.Pp
+The first job takes a lock and sleeps for 1 second in the background.
+The second job waits up to 5 seconds to take the lock and echoes the message on
+success (PID numbers will differ):
+.Bd -literal -offset indent
+$ lockf mylock sleep 1 & lockf -t 5 mylock echo "Success"
+[1] 19995
+Success
+[1]+ Done lockf mylock sleep 1
+.Ed
.Sh SEE ALSO
.Xr flock 2 ,
.Xr lockf 3 ,

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