Encrypt a file using gpg with shell wrappers (parameters into shell)

ka1.sh

#!/bin/bash
#First we make sure they have input a parameter for the program to encrypt
if [ "$1" = "" ]; then
   echo Must have a file to encrypt 
   exit
fi
echo Please, enter your password 
#stty turns on and off a type of output. We don't want the password to be in clear text so we disable it with "stty -echo". Aftwards we return the output to it's orginal state with "stty $stty_orig".
stty_orig=`stty -g`
stty -echo
read P1 
stty $stty_orig

echo Please, enter password again
stty_orig=`stty -g`
stty -echo
read P2 
stty $stty_orig
#We double to check to make sure they entered the same password both times.  Only then do we encrypt the file.
if [ "$P1" = "$P2" ]; then
   gpg -c --passphrase $P1 $1
   rm $1
   echo File Encrypted
else
   echo Passwords did not match 
fi  

ka2.sh

#!/bin/bash
#first check to make sure they have input a file name to decrypt
if [ "$1" = "" ]; then
   echo Must have a file to decrypt
   exit
fi
echo Please, enter your password 
#stty turns on and off a type of output. We don't want the password to be in clear text so we disable it with "stty -echo". Aftwards we return the output to it's orginal state with "stty $stty_orig".
stty_orig=`stty -g`
stty -echo
read P1 
stty $stty_orig
gpg --passphrase $P1 $1 &> /dev/null
# The "$?" use a special variable that returns a number based on if an operation was successful or not. When it returns a 0 then the operation was succesful hence only then do we want to delete the encrypted file. 
if [ $? == 0 ]; then
   echo File Decrypted  
   rm $1
else
   echo Incorrect Password
fi