12/9    I'm using cygwin and sed. I need to do a tolower. I can't rely on
        perl.
        \_ sed y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/
        \_ save yourself from having to type the above and use
           tr '[a-z]' '[A-Z]'
           \_ Or "tr A-Z a-z" which is several characters shorter and works.