(SCO Unix) How can I change uppercase file names to lower case?

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How can I change uppercase file names to lower case (Old Sco Unix)?

A simplistic script would be:

 #!/bin/sh
 for i in *
 do
 j=`echo $i | tr '[A-Z]' '[a-z]'`
 mv $i $j
 done

or in ksh:

 #!/bin/ksh
 typeset -l L
 for i in * do
 L=$i
 mv $i $L
 done

These are very simple, however: they aren't recursive (which means they won't descend into sub-directories) and, more importantly, they don't check to see if the lowercase name already exists.

A better program to do this is "xxu" available (C source) from https://columbia.edu/kermit/utils.html.