I was curious how to view sessions on a Linux box I had at my desk. Similar to the session table on an Aruba controller (show loginsessions
). Here are some ways you can list active SSH sessions; some commands return more output than others. This applies to most modern Linux boxes or say a WLAN Pi.
All examples below are using 2 MobaXterm user sessions from a Windows machine to a Linux 4.14.42-sunxi64 aarch64 (NanoPi NEO2).
wlanpi@wlanpi:~$ w
15:00:36 up 2:36, 2 users, load average: 0.21, 0.20, 0.18
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
wlanpi pts/0 192.168.1.68 14:51 0.00s 0.41s 0.01s w
wlanpi pts/2 192.168.1.68 13:00 9:00 0.49s 0.49s -bash
wlanpi@wlanpi:~$ who
wlanpi pts/0 2018-05-23 14:51 (192.168.1.68)
wlanpi pts/2 2018-05-23 13:00 (192.168.1.68)
This one is for when you're in a pseudo shell and should return your IP and port and the IP you're connected to and port. This won't show other sessions.
wlanpi@wlanpi:~$ echo $SSH_CONNECTION
192.168.1.68 5875 192.168.1.94 22
wlanpi@wlanpi:~$ sudo netstat -tnpa | grep 'ESTABLISHED.*sshd'
tcp 0 0 192.168.1.94:22 192.168.1.68:19172 ESTABLISHED 927/sshd: wlanpi [p
tcp 0 0 192.168.1.94:22 192.168.1.68:5875 ESTABLISHED 17200/sshd: wlanpi
tcp 0 0 192.168.1.94:22 192.168.1.68:5876 ESTABLISHED 17222/sshd: wlanpi
tcp 0 0 192.168.1.94:22 192.168.1.68:19168 ESTABLISHED 886/sshd: wlanpi [p
wlanpi@wlanpi:~$ ps auxwww | grep sshd:
root 886 0.9 1.2 11872 6092 ? Ss 14:51 0:00 sshd: wlanpi [priv]
root 927 0.8 1.2 11876 6076 ? Ss 14:51 0:00 sshd: wlanpi [priv]
wlanpi 997 2.2 0.9 12060 4460 ? S 14:51 0:00 sshd: wlanpi@pts/0
wlanpi 1070 0.0 0.9 11876 4508 ? S 14:51 0:00 sshd: wlanpi@notty
wlanpi 1196 0.0 0.1 4308 580 pts/2 S+ 14:51 0:00 grep sshd:
root 17200 0.0 1.2 11872 6120 ? Ss 13:00 0:00 sshd: wlanpi [priv]
root 17222 0.0 1.2 11876 5992 ? Ss 13:00 0:00 sshd: wlanpi [priv]
wlanpi 17294 0.0 0.9 12212 4700 ? S 13:00 0:00 sshd: wlanpi@pts/2
wlanpi 17365 0.0 0.9 11876 4552 ? S 13:00 0:00 sshd: wlanpi@notty
wlanpi@wlanpi:~$ pgrep -ai sshd
777 /usr/sbin/sshd -D
886 sshd: wlanpi [priv]
927 sshd: wlanpi [priv]
997 sshd: wlanpi@pts/0
1070 sshd: wlanpi@notty
17200 sshd: wlanpi [priv]
17222 sshd: wlanpi [priv]
17294 sshd: wlanpi@pts/2
17365 sshd: wlanpi@notty
ps axjf | grep [s]shd: