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]‘
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]‘