flock(1) on Linux
The text e064dfc6f102, as Debian 7 (Wheezy) shipped it.
manage locks from shell scripts
Flags it lists
-
--close -
--command -
--exclusive -
--help -
--nb -
--nonblock -
--shared -
--timeout -
--unlock -
--wait -
-c -
-e -
-h -
-n -
-o -
-s -
-u -
-w -
-x