Remote Authentication Dial-In user Service. A standard for authentication and
accounting, RADIUS is primarily used to control dial-up access to PPP and other
services. The protocal was standardized in RFC 2058, the current implementation
is defined in RFCs 2138 and 2139. RADIUS uses UDP packets, older servers use
ports 1645 and 1646, the current standard is port 1812 for authentication and
1813 for accounting
Redundant Array of Inexpensive Disks - a method whereby information is spread
across several disks, using techniques such as disk striping (RAID Level 0) and
disk mirroring (RAID level 1) to achieve redundancy, lower latency and/or higher
bandwidth for reading and/or writing, and recoverability from hard-disk crashes
A mode in which characters entered into the Linux system are read and
interpreted one at a time
a software developer who has written a number of important Open Source programs
including fetchmail and sed. Eric also maintains 8 FAQs, amd has written a
number of influential papers including The Cathedral and the Bazaar: an analysis
of how and why the Linux development model works
rc file Script file containing startup instructions for an application program (or an
entire operating system), usually a text file containing commands of the sort
that might have been invoked manually once the system was running but are to be
executed automatically each time the system starts up
RCS the revision control system, is a suite of programs that tracks changes in text
files and controls shared access to files in work group situations. It is
generally used to maintain source code modules
rdev A utility which can be used to obtain information about your Linux system. It
can query/set the image root device, the swap device, the RAM disk size or video
read-only A file that can be read (copied, and so on) but not written (changed). Linux has
a system of permissions that enables the owner of the file, the owner's group,
or all users to have or not have permission to read, write, or execute file
A roadmap of your source distribution. By ancient convention, this is the first
file intrepid explorers will read after unpacking the source.
Real time OS a real-time operating system is able to execute all of its tasks without
violating specified timing constraints
Accepting input from a source other than the standard input or sending output to
a destination other than the standard output. Use the less than sign (<) for
redirection of input and the greater than sign (>) for redirection of output.
See regular expression.
regular expression A set of symbols, including text and metacharacters, used to search for text.
The most common components are the period (.), which matches one character; the
asterisk (*), which matches any number of characters; and brackets ([string]),
which list a set of characters to be matched
Relational Database A database that is organized and accessed according to relationships between
remote login Logging in to another computer from your own computer. This process requires
that your computer be on a network or have a phone connection
Request for Comments - Standards that define the Internet and how it operates.
RFC also refers to the way these documents are discussed and approved by the
RFS Remote File Sharing. Like NFS, a program that lets you treat files on another
computer in more or less the same way as you treat files on your own computer
Rlogin starts a terminal session on a remote host.
removes each given file. By default, it does not remove directories.
removes empty directories.
They are an add-on to the traditional ISO 9660 format. These extensions are
necessary to handle the long file names and deeply nested directories frequently
used in Linux programs.
the background of your screen. It is referred to a window in name alone, it does
not behave like any other window, but rather you run your applications on the
root window, or put a picture on it, or just a solid color
A special-purpose computer (or software package) that handles the connection
between 2 or more networks. Routers spend their time looking at the destination
addresses of the packets passing through them and deciding which route to send
Remote Procedure Call. RPC routines allow C programs to make procedure calls on
other machines across the network. When people talk about RPC they most often
mean the Sun RPC variant
Report Program Generator - A system produced by IBM in 1965 for easy production
of sophisticated large system reports
Red Hat Package Manager - an open packaging system
A standard for serial communication that is used to connect computers,
terminals, printers, and modems. The complete standard calls for 25 wires, but
many configurations use as few as three (send, receive, and ground)
The groups of processes which are started by init are controlled by the runlevel.
The runlevel is a digit from 0 to 6 or the letter S. Runlevels 0, 6 and S are
reserved for shutdown, reboot and single user mode. Runlevel 1 is also single
Last Updated Saturday, December 04 2004 @ 11:13 AM EST