whoami(1) — Commands
NAME
whoami − Displays the user’s name
SYNOPSIS
whoami
DESCRIPTION
The whoami command displays the username associated with your current ID.
Unlike who am i, this command tells you what your effective user ID is, and not who is logged on to your tty (it does not use /var/adm/utmp).
If the current user ID is not in the password file, the message Intruder alert is displayed.
FILES
/etc/passwd
Contains usernames and IDs.