/security/

Nmap 79 finger

2017-12-22 01:08:44

79/tcp open finger Linux fingerd - User Enumeration

nmap -n -sV -Pn -p- 192.168.0.102
...
79/tcp    open  finger     Linux fingerd 
...

can check if any user is logged on

finger @192.168.0.102

other options

finger root@192.168.0.102
finger szalek@192.168.0.102
finger user@192.168.0.102