#!/bin/bash

echo '___________________________________________'
echo 'Script to convert Lowercase to Uppercase'
echo '___________________________________________'
echo "1.Lowercase to Uppercase"
echo "2.Exit"
echo '___________________________________________'
echo -e "Enter Your Choice \c"
read ch
case "$ch" in
1) echo -e "Enter The Filename \c"
read f1
if [ -f $f1 ]
then
echo "Converting Lowercase to Uppercase"
tr '[a-z]' '[A-Z]' <$f1
else
echo "$f1 File Does't Exists"
fi ;;
2)
exit;;
esac

kodingwindow@kw:~$ bash kw.sh
___________________________________________
Script to convert Lowercase to Uppercase
___________________________________________
1.Lowercase to Uppercase
2.Exit
___________________________________________
Enter Your Choice 1
Enter The Filename kw.txt
Converting Lowercase to Uppercase
SHELL SCRIPTING IS VERY EASY
kodingwindow@kw:~$