Issues with Simply Bash Script

[zgould]

I'm new to Bash scripting, and I'm simply trying to make a "E-mail creation" script that will check to see if there is already an e-mail in the file, and if so it gives you a error. If not, it adds the e-mail. I can't get it to work, any ideas?

The script either keeps adding the same e-mail over without erroring out, or I've made it error out, but it matches the entire string (Meaning it doesn't differentiate between zgould@hank.com, or zgould@cheese.com, it errors on both)

Thank you!

#!/bin/bash
FILE=/etc/postfix/sender_dependent_relayhost
echo "Please Enter Username:"
read Username
sleep 2
echo "Please Enter Domain (Include @):"
read Domain
sleep 2
email=$Username$Domain
#########

cmd=$(grep -Fxq "$email" $FILE)

if [ "$email" == "$(cat $FILE)" ];
then
echo "Already Exists"
else
echo -e "$email \t mci02-mailenc001.arsalonmessaging.net:25" >> /etc/postfix/sender_dependent_relayhost

echo

########
echo "E-mail $email has been added"
sleep 1
echo
#######
/root/mailconf/reload-postfix.sh
echo
echo -e "E-mail has been added. Be Well"
fi
~

[dasein]

I'm not 100% convinced that this isn't a homework problem, so pardon me if I don't do more than point you in the right direction...

My entirely rhetorical question to you is: what's that grep doing in there? (To be clear, I'm not saying that it does--or doesn't--belong in there; I'm suggesting that once/if you figure out what the grep is doing, you'll be one step closer to seeing the underlying problem.)

[GarryRicketson]

Code: Select all

man grep 

might help, in understanding what the grep command does.