JSI Tip 7308. The Windows XP and Windows Server 2003 Whoami utility.

When you use the Windows XP CMD help., or Windows Server 2003 CMD help, and press Whoami on the New command-line tools page, you see:

Returns domain name, computer name, user name, group names, logon identifier, and privileges for the user who is currently logged on.

whoami \{/upn | /fqdn | /logonid\}

whoami \[\{/user | /groups | /priv\}\] \[/fo Format\]

whoami /all \[/fo Format\]

/upn

Displays the user name in user principal name (UPN) format.

/fqdn

Displays the user name in fully qualified domain name (FQDN) format.

/logonid

Displays logon ID.

/user

Displays the current user name.

/groups

Displays group names.

/priv

Displays privileges.

/fo Format

Specifies the output format. The following table lists valid Format values.

Value	Description
table	Displays output in a table. This is the default value.
list	Displays output in a list.
csv	Displays output in comma-delimited (.csv) format.

/all

Displays the active user name and groups, and the security identifiers (SID) and privileges in the current access token.

/?

Displays help at the command prompt.

Whoami displays the complete contents of the access token (for example, the current user's security context) in the command window. It displays the user name and security identifier (SID), the group names, types, attributes and their SIDs, the privileges and their status (for example, enabled or disabled), and the logon ID.

To learn the domain and user name of the person who is currently logged on to this computer, type:

whoami

Whoami returns the domain of the user followed by the user name. Output similar to the following appears in the Command Prompt window:

DOMAIN1\administrator

To display all of the information in the current access token, type:

whoami /all