File comparison using shell script

if [ $# -ne 2 ]

then

echo " invalid argument "

fi

if [ ! -f $1 ]

then

echo "file $1 is not exist "

fi

if [ ! -f $2 ]

then

echo " file $2 is not exist "

fi

if cmp $1 $2 >> \dev\null

then

echo " The files are same"

tac $1 > $2

rev $2 > $1

rm $2

echo The content of file $1 is :

cat $1

else

echo " The files are not identical "

fi