>>What would you do?  What WOULD you do?
>
>for i in *.cpp
>do
>	mv $i ${i%.cpp}.c
>done

nice, but i'm not that conversant with sh stuff like this.

>For extra credit
>
>	ls *.cpp | while read i
>	do
>		j=`echo $i | tr A-Z a-z`
>		mv $i ${j%.cpp}.c
>	done

that's more like what i'd do.  or i'd use

   #!/usr/local/bin/perl
   # rename script examples from lwall:
   #	rename 's/\.orig$//' *.orig
   #	rename 'y/A-Z/a-z/ unless /^Make/' *
   #	rename '$_ .= ".bad"' *.f
   #	rename 'print "$_: "; s/foo/bar/ if <stdin> =~ /^y/i' *
   # 
   # shows good use of eval operator 

   $op = shift;
   for (@ARGV) {
       $was = $_;
       eval $op;
       die $@ if $@;
       rename($was,$_) unless $was eq $_;
   }

and type

   rename 's/.CPP$/.C/' *.CPP

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