<![CDATA[clear
opt=y
while [ $opt = y ]
do
clear
echo "----------Menu driven program --------"
echo
echo
echo "1. Usage of tail command "
echo
echo "2. Usage of cmp command"
echo
echo "3. Usage of uniq command"
echo
echo "4. Usage of rm -r command"
echo
echo "enter your choice"
read ch
case $ch in
1) clear
echo "================================"
echo "tail displays lines from bottom of the file"
echo
printf "enter number of lines to display"
read n
echo
echo last $n lines of file temp "
echo "------------------------"
echo
tail -$n temp;;
2) clear
echo "================================"
echo "cmp compares two files and gives the point of difference"
echo
echo temp1 and temp2 are compared
echo "------------------------"
echo
cmp temp1 temp2;;
3) clear
echo "================================"
echo "uniq eliminates adjacent duplicate lines"
echo "======================================="
echo
echo unique lines of temp1
echo
echo "------------------------"
cat temp1 | sort | uniq;;
4) clear
echo "================================"
echo " rm -r deletes the directory along wih contents"
echo "============================================="
echo
echo "enter the subdirectory name"
read subdir
mkdir $subdir
cd $subdir
touch file1 file2
echo current directory is `pwd`
cd ..
if rm -r $
then
echo $subdir removed succesffully
fi;;
*) echo "invalid choice"
esac
echo "do you like to continue ?"
read opt
done
echo
tail -$n temp;;
]]>
