@cindex copying existing permissions
@cindex permissions, copying existing
-You can base part of a file's permissions on part of its existing
-permissions. To do this, instead of using @samp{r}, @samp{w}, or
-@samp{x} after the operator, you use the letter @samp{u}, @samp{g}, or
-@samp{o}. For example, the mode
-
+You can base a file's permissions on its existing permissions. To do
+this, instead of using @samp{r}, @samp{w}, or @samp{x} after the
+operator, you use the letter @samp{u}, @samp{g}, or @samp{o}. For
+example, the mode
@example
o+g
@end example
-
@noindent
-@c FIXME describe the ls -l notation for showing permissions.
adds the permissions for users who are in a file's group to the
permissions that other users have for the file. Thus, if the file
started out as mode 664 (@samp{rw-rw-r--}), the above mode would change