it is advantageous to use a message file different from the default
internally defined by vacation, which is
.vacation.msg. For example, consider the need to
maintain a menu of messages to chose from, depending on the
situation. In the following example, all the messages are kept in a
|"/usr/ucb/vacation -m .vacation/weekend you"
The -m command-line switch causes
vacation to reply using the message file
specified in place of the default file. Only one
-m can be specified. If you attempt to specify
more than one message file with multiple -m
command-line switches, only the last one listed will be used.