id options

          This command provides a means of getting,  setting  and
          converting user, group and process ids.  The id command
          has the following options:

          id user ?name?

          id userid ?uid?
               Set the real and effective user ID to name or uid,
               if  the  name  (or  uid)  is valid and permissions
               allow it.  If the name (or uid) is not  specified,
               the current name (or uid) is returned.

          id convert userid uid

          id convert user name
               Convert a user ID number to a user name,  or  vice
               versa.

          id group ?name?

          id groupid ?gid?
               Set the real and effective group  ID  to  name  or
               gid, if the name (or gid) is valid and permissions
               allow it.  If the  group  name  (or  gid)  is  not
               specified,  the  current  group  name  (or gid) is
               returned.

          id groups

          id groupids
               Return the current group access list of  the  pro-
               cess.   The  option groups returns group names and
               groupids returns id numbers.

          id convert groupid gid

          id convert group name
               Convert a group ID number to a group name, or vice
               versa.

          id effective user

          id effective userid
               Return the effective user name, or effective  user
               ID number, respectively.

          id effective group

          id effective groupid
               Return the  effective  group  name,  or  effective
               group ID number, respectively.

          id effective groupids
               Return all of the groupids the user  is  a  member
               of.

          id host
               Return the hostname of the system the  program  is
               running on.

          id process
               Return the process ID of the current process.

          id process parent
               Return the process ID of the parent of the current
               process.

          id process group
               Return the process group ID of  the  current  pro-
               cess.

          id process group set
               Set the process group ID of the current process to
               its process ID.

          id host
               Returns the standard host name of the machine  the
               process is executing on.

               On  Windows  95/NT,  only  the  host  and  process
               options are implemented.

     This command is provided by Extended Tcl.