Mine

#!/bin/bash

#This script greps the 'cards' file for all Mantle cards
#(case insensitive) and displays the results to standard output.

#grep cards file for string 'mantle' and output the results.
if grep -i 'mantle' cards
   then
   echo "Cards Found."
   else
#If no string is found output the results
   echo "No Mantle cards exist."
fi