Linux

Find that whether the file is exixt or not

echo "Enter the file name"
read f
if [ !e $f]
then
echo "Sorry $f file does not exist"
else
echo "File exist"
fi

Program to calculate the factorial of any number 

echo "Enter a number"
read a
f=1
i=1
while [ $i -le $a ]
do
f=` expr $f \* $i`
i=` expr $i +1`
done
echo "Factorialof $n is" $f  

Program to create the login page 

clear
c=1
while [ $c -lt 4 ]
do
 echo "enter user name:"
 read uname
 echo "enter password:"
 stty -echo
 read pass
 stty echo
 if [ $uname = "admin" -o $uname = "ADMIN" ]
 then
   if [ $pass = "root" -o $pass = "ROOT" ]
   then
      sh smenu.sh
	exit 
  else
      echo "INCORRECT PASSWORD"
      c=`expr $c + 1`   
   fi
 else
   echo "INCORRECT USER NAME"
   c=`expr $c + 1`
 fi
done