id [ @var{option} ]@dots{} [ @var{username} ]
@end example
-By default, it prints the real user ID, real group ID, effective user ID
-if different from the real user ID, effective group ID if different from
-the real group ID, and supplemental group IDs.
+By default, it prints the real user id, real group id, effective user id
+if different from the real user id, effective group id if different from
+the real group id, and supplemental group ids.
Each of these numeric values is preceded by an identifying string and
followed by the corresponding user or group name in parentheses.
@itemx --group
@opindex -g
@opindex --group
-Print only the group ID.
+Print only the group id.
@item -G
@itemx --groups
@itemx --real
@opindex -r
@opindex --real
-Print the real, instead of effective, user or group ID. Requires
+Print the real, instead of effective, user or group id. Requires
@code{-u}, @code{-g}, or @code{-G}.
@item -u
@itemx --user
@opindex -u
@opindex --user
-Print only the user ID.
+Print only the user id.
@end table
@section @code{su}: Run a command with substitute user and group id
@pindex su
-@cindex substitute user and group IDs
-@cindex user ID, switching
+@cindex substitute user and group ids
+@cindex user id, switching
@cindex super-user, becoming
@cindex root, becoming
The shell to use is taken from @var{user}'s @code{passwd} entry, or
@file{/bin/sh} if none is specified there. If @var{user} has a
password, @code{su} prompts for the password unless run by a user with
-effective user ID of zero (the super-user).
+effective user id of zero (the super-user).
@vindex HOME
@vindex SHELL