R

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-r file comparison operators 2nd
RAID arrays 2nd
RAM
     disk images (kernel)
     Ubuntu installation on legacy hardware
RARP (Reverse Address Resolution Protocol)
raw files
rc.sysinit script
rcp command, SSH servers
RCS (Revision Control System) 2nd
RDBMS (Relational Database Management Systems)
     data storage
     SQL
         commands, whitespace
         CREATE statements
         creating tables
         INSERT statements
         inserting data into tables
         reserved keywords
         retrieving data from databases
         SELECT statements
     table relations
Real Player website
rebooting systems
recipes (Procmail)
recompiling kernels
recording sound
recovering files
recovery mode, booting into
recovery plans
Red Hat Software website
redirection
redo statements (Perl)
references (PHP)
regular expressions 2nd
regular users, changing identities of
relational databases [See RDBMS (Relational Database Management Systems).]
relaying email, Postfix MTA
remote access
     key-based logins
     SSH servers
         configuring
         disabling SSH1
         ftp command
         rcp command
         scp command
         sftp command
         ssh-keygen command
     Telnet servers
     VNC
     XDMCP
remote computer logins
remote files, copying
remote printers
     CUPS GUI
     LAN, enabling on
     SMB printing
remote servers
     copying files to
     security
Removable Drives and Media
removable storage media
repeating
     statements
     strings, Python
repositories (software), configuring
Request For Comment 959 website
rescue disc
reserved SQL keywords
resetting date/time
resolutions (monitors), changing
resources
     PHP
     usage, printing via top shell command
restoring
     files from backups, tar command-line backup software
     MBR
restricted shells, elevation of privileges
retrieving data from SQL databases
REVOKE statement
     PostgreSQL
     SQL
revoking privileges
     MySQL
     PostgreSQL
RFC (Request For Comments) protocol
.rgb graphics file format
Rhythmbox music player 2nd
ripping CDs 2nd
rm command 2nd 3rd
rmdir dir command
rmmod command, modular kernel management
root accounts
     accessing
     enabling
     IRC
     remote server security
     rm command
     sudo command
     system reboots
     system shut downs
     users, creating/deleting
root terminal, enabling access to
root users
     LDAP
     MySQL
route network configuration tool
routers
rpm command, building Apache Server source code
rs graphics file format
rsh shell
rsync command, copying files
rtools, copying files
run-control levels, defining
run-parts command
runlevels
     changing
     default runlevels, booting to
     defining
     nondefault runlevels, booting to
     troubleshooting
runtime errors (kernel), troubleshooting