Plan 9 from User Space's /usr/local/plan9/lp/bin/ 

-rwxr-xr-x  1 rsc  users   53 Mar 17  2010 UNLOCK
-rwxr-xr-x  1 rsc  users  377 Mar 17  2010 lpsend.rc

Space Glenda

Copyright © 2005 Lucent Technologies, Russ Cox, MIT.
See license for details.