.mh is the This article is about the Internet An internet is a more general term for any set of interconnected computer networks that are connected by internetworking Graphic representation of the WWW information network structure around Wikipedia, as represented by hyperlinks The Internet, or simply the Net, is the publicly available worldwide...
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MH and xmh are fine for beginners: there are just a few basic concepts and commands to learn.
Because MH commands aren't part of a monolithic mail system, you can use them at any time; you don't have to start or quit the mail agent.
This book explains differences between MH and nmh at the place that seems the most logical to me--usually in the general introduction to a command or feature.
MH is a Message Handling system originally developed at RAND, then improved and widely distributed by the University of California at Irvine.
MH is an MUA designed with the UNIX philosophy of ``create lots of small tools that do simple things well, and provide a flexible way to put them together to do things.'' This tool philosophy is very different from the application philosophy that some people have, in which just one program should do everything.
MH commands are generally issued directly from the shell; thus all the normal flexibility and power of shell features (e.g.