Unix Jargon File Wanted

[ZZASSGL%cms.manchester-computing-centre.ac.uk at nsfnet-relay.ac.uk]

I'm currently writing an introduction to Unix for new users of our
mainframe Unix system here.  I want to include a guide to Unix jargon,
starting at a very low level ( ie what is a path, what is a directory,
what is a shell etc) and working up.  The readers of the guide may not
have ever used Unix before.
 
Is there something similar already available somewhere I could copy
and adapt?  It must be free of copyright problems.
 
Geoff. Lane.
UTS Sys Admin
mcc