Convert upper case to lower case
cat /tmp/blah | tr '[A-Z]' '[a-z]'
and to convert from lower case to upper case
cat /tmp/blah | tr '[a-z]' '[A-Z]'
Your Guide To All Things Cain™
cat /tmp/blah | tr '[A-Z]' '[a-z]'
and to convert from lower case to upper case
cat /tmp/blah | tr '[a-z]' '[A-Z]'