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Usefull if you want to check if something is applying a dictonary of brute force.
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You should look at combining commands to make the command more efficient. I think you can get this down to one grep call if you use grep with the "-c" argument and make a regular expression out of your search strings.
Something like this:
grep -cE '\<(month.*ipop.*failed)\>' /var/log/auth.log