O

Object-oriented programming, 729–730

Objects in Java, 737–738

Octet, explained, 485

od command, 568

Office applications (GNOME), 183–184

Office applications (KDE), 213–215

Office automation packages, 758–761

Office suites, web authoring with, 828

oleo spreadsheet program, 765–766

onGO (Uniplex), 759–761

open command, in Perl, 658–659

Open Group, 16–18, 33

Open Office, 19

Open source code, importance of, 4

Open source software, 755–757

OpenBSD, 21

OpenDarwin, 23

OpenGL tool, 726

OpenOffice suite, 207, 758

under GNOME, 183–184

under KDE, 214

Writer module, 759

OpenSolaris, 22

Operating environments (HP-UX), 24

Optimizer (of gcc compiler), 708

Oracle, 767–768

Orange Book levels of security, 353–354

Ordinary files, 60–61

Organizational domains (Internet), 273

Orphan process, 307

OSF (Open Software Foundation), 15

OSF/1, 15, 25–26

Output, saving to file, 574–575

Output redirection operator (>), 101

Output redirection to a file, 101

Overwritten file contents, 101

Owner (user), 80, 84