Last logins linux
Last 20 login records with IP and duration
last -n 20 | head -25
more linux
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Failed login attempts
journalctl -u ssh --since '24h ago' | grep 'Failed password' | awk '{print $(NF-3)}' | sort | uniq -c | sort -rn | head -10
Check sudo access
sudo -l -U <username>
Add user to group
usermod -aG docker,sudo alice
Show /proc memory maps
cat /proc/<pid>/smaps | awk '/^Size/{sum+=$2} END{print sum/1024" MB"}'
Anonymous huge pages status
grep -E 'HugePages|AnonHugePages|Transparent' /proc/meminfo