👤 Users & Connections

1last              # the last user connections to a server (based on /var/log/wtmp or btmp).
2ac -d             # statistics of my connection time per day.
3ac -p <user>      # the connection time of all users (or of a specific user).
4finger            # who is connected (-l to also see mails and plans of all users).
5w                 # who is connected, doing what, and how much CPU they use.
6who               # who is connected (-u for more info: PID, etc.).
7who am i          # with which login I am connected.
8id -a             # all info about the user I'm connected as (more precise than "who am i").
9logname           # the login name of the current account.

1last reboot   # see all the reboots that took place.
2uptime        # see how long the server has been up + the load average.
3lslogins -L   # also shows whether a user shutdown/rebooted the machine.