In the case of Perl, I think it's just because of the acronym that people assume it should always be upper case. As for UNIX, the Free On-line Dictionary of Computing (http://foldoc.doc.ic.ac.uk) says:

"Unix" or "UNIX"? Both seem roughly equally popular, perhaps with a historical bias towards the latter. "UNIX" is a registered trademark of The Open Group, however, since it is a name and not an acronym, "Unix" has been adopted in this dictionary except where a larger name includes it in upper case. Since the OS is case-sensitive and exists in many different versions, it is fitting that its name should reflect this.

In reply to Re: Perl and Unix versus PERL and UNIX by jasonk
in thread Perl and Unix versus PERL and UNIX by Anonymous Monk

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