V

vacation command, for e-mail, 243

Valgrind tool, 726

values function (Perl), 653

Variable expansion, special, 590–591

Variable names, grouping, 590

Variable scope

in Perl, 648

in Python, 687–688

Variables, 589–593

in awk, 626–628

in Java, 738, 741

providing default values for, 590–591

reading from Perl standard input, 648

Variables and aliases, assigning, 113

Variables for shell programs, special, 591–592

Variants, UNIX, 521

Vectors, in Java, 743–744

Verified design level (Orange book), 354

Verifiers, NFS, 513

Vertical applications, 7

vi (visual editor), 12, 133–150

command and input modes, 135

copying and moving text, 143

deleting text, 139–140

displaying current option settings, 146

editing multiple files, 144

entering input mode, 136–137

examples of yanking, 143

exiting, 137

inserting output from shell commands, 144

leaving input mode, 137

modifying text, 139

moving across a section of text, 138

moving around by lines or characters, 138

moving the window in the buffer, 139

moving within a window, 137

numeric options, 147

on/off options, 147

sample screen, 136

searching for text, 142

setting options, 145–146

setting terminal display type, 134–135

starting, 135–136

string options, 147

table of options, 146

ten-minute tutorial, 141–142

undoing changes and deletions, 140–141

using an EXINIT variable, 145–146

using an .exrc file, 145

working buffers, 143–144

vi macros

defining in input mode, 148

entering, 147–148

in .exrc or EXINIT, 148

search, 149–150

text-processing, 148–150

vispell, 149

writing, 147–148

vi options, 146–147

Video conferencing, GNOME, 182–183

vim editor, 133, 160

Virtual desktop (GNOME), 174

Virtual desktop (KDE), 204–205

Virtual hosts, 471

Virtual machine environment, 541–542

Viruses, 350–351, 516

VLC media player, 786–787

VMware environment, 541–542

VNC (Virtual Network Computing), 533, 536

vnews (visual news), 278–279

vnews commands, 278–279

VOCAL project, 788

Voice over IP, 787

VTOC (volume table of contents), 407

VUE (Visual User Environment), 24, 193