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Full Discussion: UNIX command to reverese lower and upper case
Top Forums Shell Programming and Scripting UNIX command to reverese lower and upper case Post 302120913 by Perderabo on Saturday 9th of June 2007 11:10:09 AM
Old 06-09-2007
I would expect it to work with single quotes as well:
Code:
$ echo RED sox | tr 'a-zA-Z' 'A-Za-z'
red SOX
$

rfourn, what version of Unix are you using? And what shell?

The pre-posix USG based version of tr used to require brackets around a range. On such a version,
tr '[a-z]' '[A-Z]'
would work for sure. I don't remember for sure if multiple ranges would work, but I think they did. If so,
tr '[a-z][A-Z]' '[A-Z][a-z]'
would work. BSD never required the brackets and Posix adopted the BSD style for ranges. Legacy USG scripts will tend to work with a Posix version of tr because with
tr '[a-z]' '[A-Z]'
brackets are being replaced by themselves. A legacy USG scrip with code like:
tr 'a-z'
where the 'a-z' is supposed to be exactly 3 characters will fail though.

I hope you aren't using a very old version of Unix with behavior like this. But if you are, it is especially crucial that you mention your Unix version with every question.
 

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