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Correction noted. My point was that the "==" works on the other platforms I use and had no reason to think it would not work here. Is the "==" operator non-POSIX?

While I agree, I'm not sure I see your point. O'Reilly's "Learning the Korn Shell" makes no mention of POSIX concerns with either of my examples. (In fact, page 143 of the 2nd edition specifically...

I have a number of Korn scripts I've used successfully for years in AIX (4.3 and 5.x) and Solaris (9 and 10). Recently I've had to start porting them to HP-UX (11i V3) and run into a few unexpected...