Guide to Unix/Commands/Self Information

whoami
whoami tells you your current username.

Examples: $ whoami abicool

Links:
 * whoami, freebsd.org
 * 20.3 whoami in GNU Coreutils manual, gnu.org

groups
groups states the groups the current user is a member of

Examples:

$ groups wheel slocate www

Links:
 * groups, freebsd.org
 * 20.4 groups in GNU Coreutils manual, gnu.org

id
id gives you the same information as the whoami and groups commands, but also includes the user id (uid) and group id (gid) integers associated with the login.

Examples:

$ id uid=3426(alice) gid=10(wheel) groups=10(wheel),21(slocate),401(www)

Links:
 * id, opengroup.org
 * 20.1 id in GNU Coreutils manual, gnu.org

tty
tty tells you the terminal device that is assigned to your interactive login. The tty represents your console device, network connection ("ssh", ...), or terminal emulator process ("xterm", "konsole", ...).

Examples:

$ tty /dev/pts/14

Links:
 * tty, opengroup.org
 * tty man page, man.cat-v.org
 * 19.4 tty in GNU Coreutils manual, gnu.org