Shell Programming and Scripting

Is there a way of incorporating a send email email part if the awk commad finds a difference between the files? I just want to send a mail if there's an output and not send one if nothing is found..

Code:

awk 'NR==FNR{a[$0];next}$0 in a{next}1' file2 file1 > file3

I also found that the

Code:

comm -2 -3 file1 file2 > file3

seems to work to... Is there a way to send the email with that piece of code?


EDIT **
Would i be right in saying I could just use

Code:

if [[ -s file3 ]] ; then
mail -s "File not empty" email@email.com < file3
else
echo "File was empty" >> $LOG
fi;

Do I need that extra ; after the fi?

No, you don't need that semi colon after fi.