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

-rwxr-xr-x  1 rsc  users   535 Mar 17  2010 isspam
-rwxr-xr-x  1 rsc  users  1084 Mar 17  2010 msgcat
-rwxr-xr-x  1 rsc  users   386 Mar 17  2010 spam
-rwxr-xr-x  1 rsc  users   282 Mar 17  2010 spambox
-rwxr-xr-x  1 rsc  users   390 Mar 17  2010 unspam
-rwxr-xr-x  1 rsc  users   286 Mar 17  2010 unspambox

Space Glenda

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