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In computing, whoami is a command found on most Unix-like operating systems, Windows Vista, Windows 7, Windows 8, Windows Server 2003, and Windows Server 2008. It is a concatenation of the words "Who am I?" and prints the effective 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 log in. 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 earliest versions were created in 2.9 BSD as a convenience form for who am i, the Berkeley Unix who command's way of printing just the logged in user's identity.[1] The GNU version was written by Richard Mlynarik and is part of the GNU Core Utilities (coreutils).

The command is also available as part of the Windows 2000 Resource Kit[2] and Windows XP SP2 Support Tools.[3]

This command was also available as a NetWare-Command residing in the public-directory of the fileserver. It also outputs the current connections to which server the workstation is attached with which username.

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