Lab 6: write a menu driven program to demonstrate commmands a) cat b)Who c)ls

while [ 1 ]
do
echo "menu"
echo "1.cat"
echo "2.who"
echo "3.ls"
echo "Enter the choice"
read choice
case $choice in
1)    echo "Enter the name of the file to create"
    read filename
    echo "Now start entering the contant of the file and save by             pressing ctrl+d"
    cat>$filename;;
2)    echo "Display all those user who r currently logged in to the             system"
    who;;
3)    echo "Listing all files and directories"
    ls;;
4)    exit;;
    *) echo "Invalid choice";;
esac
done