SSH brute-force fingerprints: how to read /var/log/auth.log without grep madness — awk one-liners that actually work
Open /var/log/auth.log on a public-facing server and you’ll see thousands of lines per day — failed logins, accepted logins, sudo events, cron registrations. The signal you usually care about (who’s brute-forcing me, from where, against which users?) is buried in …