logon

w
w -h
w -u
w -s
who
who | cut -d' ' -f1 | sort | uniq
users
whoami
id -un
who am i
who mom likes
last jason

https://www.thegeekstuff.com/2009/03/4-ways-to-identify-who-is-logged-i…

http://answers.microsoft.com/en-us/windows/forum/windows_7-security/can…