What's a New Command Version?
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In UNIX, you can give the same command more than one name.
For instance, typing the command view will run the vi
program -- but the program will notice that you've run it with the name
view, so it automatically sets its read-only mode.
You can do the same thing with MH programs.
(Besides this chapter,
there are some good examples in the miscellany/mtrenv directory
of the MH distribution.)
An MH command will run the same way, no matter what name you give
it -- but it will look for an entry in your MH profile
with the name you use to run it.
For example, you can set a second name for the repl command
called replx (see the directions below).
Then, add an entry with the new name to your MH profile.
repl: -query
replx: -query -filter filter_file
Then, if you type:
% replx 23
the program will run as if you'd typed
repl -query -filter filter_file 23
and read a copy of your original message into your draft reply.
New versions are easy to make -- almost as easy as shell aliases.
Usually, you don't even have to be a programmer.
(It might help to have a guru "on call" when you do the first setup.)
The Section
Making a New Command Version explains how to make them.
Unlike
shell aliases or functions, MH command
versions can be run by any other MH or UNIX command.
You can use MH command versions in at or cron jobs, from
inside a shell script, from another MH command, from a C or perl
program, and so on.
Sometimes, though, an alias or function is all you need.
The Section
Writing Command Versions as Aliases or Functions
tells how to write these versions as an alias
or function.
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