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Berkeley Remote ("r") Commands
TCP/IP has achieved success in large
part due to its universality: it has been implemented on virtually every
major computing platform. While the suite is thus not specific to any
operating system, there is no denying that its history is closely tied
to a particular oneUNIX. Most of the computers on the early Internet
used UNIX, and the development of TCP/IP has paralleled that of UNIX
in a number of respects.
One of the most important organizations
involved in the development of UNIX, and thus TCP/IP indirectly, was
the University of California at Berkeley. Their well-known Berkeley
Software Distribution (BSD) UNIX has been in widespread use for
over 20 years. A set of commands was developed for BSD UNIX to facilitate
various remote operation functions over a TCP/IP internetwork. Each
of these programs begins with the letter r (for remote),
so they have come to be known as both the Berkeley remote commands
(or utilities) and also simply the r commands. Since
their initial creation, they have been adopted for most variations of
UNIX, and some other operating systems as well.
In this section I provide a brief
description of the Berkeley remote protocols and how they are used.
I begin with a discussion of the main protocol in this group, rlogin,
and how it is used to enable remote host access. I then describe the
remote shell program, rsh, and how it allows a command to be
executed on a network host. I conclude with a brief summary of the other
members of the r protocol family: rcp, ruptime
Background Information: This section will probably make much more sense to those who have some understanding of the UNIX operating system than those who do not. I also make some reference to Telnet in this section so you may wish to have at least basic familiarity with that protocol.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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