https://gonpress.tistory.com/40
https://zetawiki.com/wiki/%EB%A6%AC%EB%88%85%EC%8A%A4_%EC%A0%91%EC%86%8D%EA%B8%B0%EB%A1%9D_%ED%99%95%EC%9D%B8_last
https://zetawiki.com/wiki/%EB%A6%AC%EB%88%85%EC%8A%A4_%ED%8C%A8%EC%8A%A4%EC%9B%8C%EB%93%9C_%ED%84%B8%EB%A0%B8%EB%8A%94%EC%A7%80_%ED%99%95%EC%9D%B8%ED%95%98%EA%B8%B0
last -f /var/log/btmp
- 최근이 밑으로 오도록 정렬 (오름차순)
last -f /var/log/btmp | tac
last -f /var/log/wtmp
- 최근이 밑으로 오도록 정렬 (오름차순)
last -f /var/log/wtmp | tac
lastlog -u userid
ex) lastlog -u root
cat /var/log/secure* | grep Accepted | awk '{print $9"\t"$11"\t"$14}' | sort | uniq
=====================================================================
[root@localhost etc]## cat /var/log/secure* | grep Accepted | awk '{print $9"\t"$11"\t"$14}' | sort | uniq
계정1 118.235.14.106 ssh2
계정1 118.235.14.112 ssh2
계정1 118.235.14.172 ssh2
계정1 192.168.55.184 ssh2
계정2 192.168.55.184 ssh2
=====================================================================