snlockf(8) debian man page | unix.com

lockf(8)						      System Manager's Manual							  lockf(8)

NAME
       lockf - lock files from within shell-scripts (used by sn news system)

SYNOPSIS
       lockf

DESCRIPTION
       lockf  can  be  used  to lock files from within shell-scripts. Filedescriptor 3 is always locked, and the lock remains until the process is
       killed.	The process-id is written to standard output, as to facilitate killing the process.

       It is used by the sn news system.

SEE ALSO
       sn(8)

																	  lockf(8)