GTU OS Practical- 11
Shell programming using filters (including grep, egrep, fgrep)
				
					echo "Main Menu"
echo "Press 1 for using Grep Command"
echo "Press 2 for using Egrep Command"
echo "Press 3 for using Fgrep Command"
read a

case $a in
                1) echo "For single pattern search, Enter Pattern below :"
                   read b
                   grep "$b" City_names.txt
                   ;;
                2) echo "For double Pattern search, Enter b,c pattern :"
                   read b
                   read c
                   egrep "$b" City_names.txt
                   grep -E "$c" City_names.txt
                   ;;
                3) echo "For Pattern From a File, Enter Pattern :"
                   read b
                   grep -F "$b" City_names.txt
                   ;;

esac