SSH ::: Viewing Connected Sessions On Ubuntu
1. The who Command
$ who
2. The w Command
$ w
3. The last Command
$ last | grep 'still logged in'
4. The netstat Command
$ netstat -atnp | grep 'ESTABLISH.*sshd'
5. The ss Command
$ ps axfj | grep sshd
6. The ps Command
$ ps axfj | grep sshd