High Quality Content by WIKIPEDIA articles! whoami is a command found on most Unix-like operating systems, Windows Vista, Windows 7, and Windows Server 2008. It is a concatenation of the words "Who am I?" and prints the effective userid (username) of the current user when invoked. It has the same effect as the Unix command id -un. On Unix-like operating systems, the output of the command is slightly different from $USER because whoami outputs the username that the user is working under, whereas $USER outputs the username that was used to login. For example, if the user logged in as John and su into root, whoami displays root and echo $USER displays John. This is because the su command does not invoke a login shell by default. The GNU version was written by Richard Mlynarik and is part of the GNU Core Utilities (coreutils).

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