WHOAMI

WhoAmI has three ways of working: 

Syntax 1:
   WHOAMI [/UPN | /FQDN | /LOGONID]

Syntax 2:
   WHOAMI { [/USER] [/GROUPS] [/PRIV] } [/FO format] [/NH]

Syntax 3:
   WHOAMI /ALL [/FO format] [/NH]

Description:
   This utility can be used to get user name and group information
   along with the respective security identifiers (SID), privileges,
   logon identifier (logon ID) for the current user (access token)
   on the local system. i.e. who is the current logged on user?
   If no switch is specified, tool displays the user name in NTLM
   format (domain\username).

Parameter List:
   /UPN                    Displays the user name in User Principal 
                           Name (UPN) format.

   /FQDN                   Displays the user name in Fully Qualified 
                           Distinguished Name (FQDN) format.

   /USER                   Displays information on the current user
                           along with the security identifier (SID).

   /GROUPS                 Displays group membership for current user,
                           type of account, security identifiers (SID)
                           and attributes.

   /PRIV                   Displays security privileges of the current
                           user.

   /LOGONID                Displays the logon ID of the current user.

   /ALL                    Displays the current user name, groups 
                           belonged to along with the security 
                           identifiers (SID) and privileges for the 
                           current user access token.

   /FO       format        Specifies the output format to be displayed.
                           Valid values are TABLE, LIST, CSV.
                           Column headings are not displayed with CSV
                           format. Default format is TABLE.

   /NH                     Specifies that the column header should not
                           be displayed in the output. This is
                           valid only for TABLE and CSV formats.

   /?                      Displays this help message.

Examples:
   WHOAMI
   WHOAMI /UPN
   WHOAMI /FQDN 
   WHOAMI /LOGONID
   WHOAMI /USER
   WHOAMI /USER /FO LIST
   WHOAMI /USER /FO CSV
   WHOAMI /GROUPS
   WHOAMI /GROUPS /FO CSV /NH
   WHOAMI /PRIV
   WHOAMI /PRIV /FO TABLE
   WHOAMI /USER /GROUPS
   WHOAMI /USER /GROUPS /PRIV
   WHOAMI /ALL
   WHOAMI /ALL /FO LIST
   WHOAMI /ALL /FO CSV /NH
   WHOAMI /?