Shell Programming and Scripting

Hi All,

Actually we want to know the command need to use if the difference between two files are null, then it should not send as mail. Oterwise it should send as mail alert.

Below for your reference,

# Email the spoolfile.
diff free_sp_new.log free_sp_old.log
[Here we need your help like,
if output of above difference is null, then no mail need to send.
And if difference in the file then mail has to be send like below line]
"PLEASE GUIDE US APPROPRIATE COMMAND NEEDS TO BE USED IN THIS LINE"
mailx -s "${SUBJECT}" ${ADDRESS} < ${SPOOLFILE}
mv free_sp_new.log free_sp_old.log
exit

Check return status of diff.
Also if you are only interested if files are not the same (ie no context information) -q will be much faster.

Code:

# Email the spoolfile.
if ! diff -q free_sp_new.log free_sp_old.log > /dev/null
then
    mailx -s "${SUBJECT}" ${ADDRESS} < ${SPOOLFILE}
    mv free_sp_new.log free_sp_old.log
fi
exit