looking for the 'lockfile' program

[Britton Kerin <britton.kerin@gmail.com>]

I'm trying to determine if the 'lockfile' program is still available
or has been obsoleted for some reason.

I'm not looking for lockfile_create or friends, nor flock, but the
program described here:

     http://linux.about.com/library/cmd/blcmdl1_lockfile.htm

Thanks,
Britton