Converting Lowercase to Uppercase,Uppercase to Lowercase

Linux(Converting Lowercase to Uppercase  Using TR Statement )

echo " TRANSLATION "
echo " ~~~~~~~~~~~~ "
echo " Enter the file name "
read fname
echo " GIVEN FILE CONTENT "
echo " ****************** "
cat $fname
echo " AFTER TRANSALATION "
echo " ----- ------------ "
cat $fname | tr [a-z] [A-Z]
Linux(Converting Uppercase to Lowercase  Using TR Statement )

echo " TRANSLATION "
echo " ~~~~~~~~~~~~ "
echo " Enter the file name "
read fname
echo " GIVEN FILE CONTENT "
echo " ****************** "
cat $fname
echo " AFTER TRANSALATION "
echo " ----- ------------ "
cat $fname | tr  [A-Z] [a-z]