im trying to find a tr command to
change all upper case to lower case and
all lower case to upper case.
for example:
file is 'RED sox'
need it changed to 'red SOX'

tried tr 'a-zA-Z' 'A-Za-z'

what an i missing??

thanx for the help

I try tr a-z A-Z

Work fine.

no good... i need the lowercase to be upper case
AND the uppercase to be lowercase..

It probably depends on the version of tr. GNU tr works just fine