Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] backups data, choosing for backup bang (!) character bash shell aliases apropos command bash scripting backup script bash executable case statements changes in system hardware alert command substitution conditionals conditionals, testing diff command disk information report environment variables example scripts Hello, World! loops 2nd quotes read command secure input shebang user interaction commands, looping through configuration files echo command environment variables help command history command keyboard shortcuts pagers prompt redirecting (piping) output set command .bash_history file .bash_profile file .bashrc file batch command BBEdit BeOS Berners-Lee, Tim Bill of Materials (.bom) files bin directory BIOS bless command block commenting (AppleScript) Blue Box .bom files Bonjour Bonjour-enabled printers, adding mDNS (multicast DNS) wide-area support boot process boot command keys boot device, changing firmware hardware boot Mac OS 9 operating system boot launchd SystemStarter Safe Mode security and setting the boot disk blessed system disk single-user and verbose boot modes Startup Disk preference panel BootX Bourne, Steven BrickHouse BSD flat files BSD layer bug reports, filing with Apple bundles bus-powered bzip2 command |