-switches are used. This permits individual fields of
-the address to be extracted with ease. The string is simply a format
-string, and the file is simply a format file. See
+switch is used. This permits individual fields of
+the address to be extracted with ease.
+The
+.I file
+is either the name of a format file or it may be
+a format string directly, if prepended with an equal sign `='.
+See