Using Linux Commands Cheat Sheet 2021, I found a few commands I did not know:
- last reboot - system reboot history, with kernel versions
- timedatectl - Query the system clock
- cal - current calendar (month and day)
- w - logged in users
- id
- last - last system logins
- pstree - processes in a tree-like diagram
- pmap - see loaded libraries
- netstat -pnltu
- netstat -nutlp