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There is no "-u" switch in the "bash" version of "typeset". Hence the syntax error. The shebang line forced "ksh" which allows "-u" in the "typeset" command.
There are many differences between...

Or more importantly "Machine 1" is running the script under "bash" and "Machine 2" is running the script unide "ksh".

Though the script name is "fn2.ksh" this is just a name. It would need a...