Range operator (..), in Perl, 650
Range patterns, explained, 622
RBAC (role-based access control), 331–332
rc shell, 94
rcp (remote copy) command, 249, 253–255
with -r option, 254
shell metacharacters with, 255
rcX.d directories, 374
read command, 608, 612
Read permissions, 81
readnews program, 277–278
Real-time processes, 320–324
reboot command, 489
Record separators in awk, 628
Records, explained, 547
Red Hat, 19
Red Hat console, 359–360
Red Hat GnoRPM, 359
Red Hat Network Alert icon
in GNOME, 186
in KDE, 217
Red Hat Network utility
in GNOME, 186
in KDE, 217
Red Hat RPM packages, 349, 460–461
Red Hat Update Agent (up2date), 368
Redirection, in UNIX vs. DOS, 527
Redirection operators, 100–102, 104
Reference material. See Manual pages
Reference monitor, in security domains, 354
Regular expressions, 98, 549–552
in awk, 622–624
explained, 622
in Perl, 661–667
in Python, 693–696
in UNIX vs. DOS, 527
Regular expressions (Perl) 661–667
constructing patterns, 661
in grep function, 664–665
in join function, 664
pattern matching, 661
sample program using, 665–667
saving matches, 661–662
in split function, 664
substitutions, 663, 666
table of, 662
translations, 663, 666
Regular expressions (Python) 693–696
constructing patterns, 694
listing matches, 695–696
pattern matching, 693–694
saving matches, 694
string splitting, 696
substitutions, 696
table of, 695
Relational model, explained, 766
Relational operators, in Java, 734
Relative pathnames, 59
Remote Commands, 249–257
Remote connection to a UNIX machine, 40
Remote host, copying files from, 253–254
Remote IP detection with PHP, 823
Remote login, 251–253, 263–264
Remote machine, copying files to, 254
Remote mail, 227–228
with mutt, 237–238
with pine, 234
Remote NFS resources
mounting, 450–452
unmounting, 452
Remote printing, 442
Remote resources
monitoring, 454
mounting, 445, 523
Remote shell, creating with rsh, 255
Removable media, writing to using Nautilus, 178–179
remsh command, 255
Repository
configuring, 720–721
files in, 720
repquota command, 418
Requests, 441
Resolvers, DNS, 502–503
Resources
browsing shared, 453–454
monitoring remote, 454
mounting remote, 450–452
sharing automatically, 449
unmounting remote, 452
Restore
backup and, 419–423
using ufsrestore, 425–426
Restore plan, 425
Restore strategy, 426–427
Restricted shell, explained, 327
return keyword in Perl, 657
return value, for a function, 597
Reverse acronym, GNU as, 13
reverse function (Perl), 651
Rewritable CDs, 403
RFB (Remote Frame Buffer), 536
.rhosts files, 250
Richie, Dennis, 9
Rights profiles, explained, 331
rindex function (Perl), 647
rlogin (remote login) command, 249, 251–253
rlogin access, 251–252
rlogin connections, aborting, 252–253
rlogin -l command, 251
rm (remove) command, 72, 98–99, 103, 130
rm -i command, 72–73
rm -ir command, 74
rm -r command, 74
rmdir (remove directory) command, 73–74
rn (read news) program, 279–281
Root, concept of, 366
Root directory (/), 58–59, 63
Root file system (/), 410–411
Root prompt, 370
Route-based mail system, 508
Router, 498–499
RPC (Remote Procedure Call), 446
checking, 509–510
secure, 447
RPC package, 509
RPM (Red Hat Package Manager), 367–368
RPM format (Red Hat), 460–461
RPM packages, 460–461
RPN (Reverse Polish Notation), 581
rsh command, 249, 255–256, 352–353
shell metacharacters with, 256
symbolic link for, 256
RSS feeds, reading, 295
RT (real-time) process class, 320
rtpi (real-time priority), 321
RUMBA suite, 532–533
Run Applications utility (GNOME), 187
Run Command utility (KDE), 220
run-parts command, 365
runoff (text formatting program), 9
ruptime command, 264–265
rwall (remote write all) command, 256–257
rwalld (rwall daemon), 256
rwho command, 264
rwhod (remote who service daemon), 490