If catfile does exist, its messages are included in the new catfile . If set and message numbers collide, the new message-text defined in msgfile replaces the old message text currently contained in catfile . The format of a message text source file is defined as fol- lows. Set identifiers within a single source file need not be contiguous. Any string following the set identifier is treated as a comment.
Any string following the set number is treated as a comment.
Mes- sage identifiers need not be contiguous. Empty lines in a message text source file are ignored. If the character following a backslash is not one of those specified, the backslash is ignored. If - is specified, standard output is used. A path name of a message text source file.