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@@ -1690,6 +1690,9 @@ extended information about users, adding an entry using this function
would inevitably leave out much of the important information.
@c Then how are programmers to modify the password file? -zw
+The group and user ID fields are left empty if the group or user name
+starts with a - or +.
+
The function @code{putpwent} is declared in @file{pwd.h}.
@end deftypefun