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Thank you Don! I am hugely embarrassed to tell you that it now turns out my "bad substitution" problem was down to a bad alias. When I substituted your prompt for mine I still had the error, so I...

Hi,

I am learning shell scripting for the first time. I use AT&T Korn Shell, Version AJM 93u+ 2012-08-01, compiled from source on NetBSD.

So far I have managed to set up what I think is a...