Error Code Email

#!/bin/sh

#This is script is meant to be an add on to another one I'm using. Based on the return code output it will mail me the #message.

read -p "What is the file name? " variable
rc = $?

ls -al $variable
if [[ $rc != 0 ]]; then
    mail -s "$variable script did not complete" email address -- -f email address \
    << EOF Your script has failed with error code $rc << EOF;
elif [[ $rc = 0 ]]; then
    mail -s "Your script completed" email address -- -f email address \
    << EOF Your script completed with error code $rc. << EOF;
fi