I want to get all info about user from auth.log file, but when I use grep user /var/log/auth.log but instead of giving me all the information with user mentioned, it just writes to me Binary file /var/log/auth.log matches. It used to pick up the sentences with mentioned user, but now it doesn’t.
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Answer
Sounds like your auth.log has some garbage in it that is making grep believe it is binary, perhaps some UTF-8 encoded data.
Either way, grep has a switch to make it treat it as text anyway
grep -a pattern /var/log/auth.log