• Make Safari Fast:
  Quit safari, then, in the Terminal, enter the following command:
  defaults write com.apple.Safari WebKitResourceTimedLayoutDelay 0.0001
  defaults write com.apple.Safari WebKitInitialTimedLayoutDelay 0.25
• Create Virtual IP Interfaces on any Adapter: Open the Network system panel, pull down the Show menu and set it to "Network port configurations," and then hit Duplicate with your Ethernet configuration selected. This will give you a second interface (or more if you duplicate it again), and second IP for the machine.
• Flush the DNS cache: lookupd -flushcache
• Place any screen saver as the background picture:
  From a terminal, enter the command: /System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background &
• Force the verbose boot (until re-booted into OS9, or OS update/reload
  nvram boot-args="-v"
• Print to a non-Postscript Network printer: % sudo lpadmin -p laserjet6L -E -v socket:192.168.0.100 -m laserjet.ppd
• To access the CUPS Interface under Jaguar, go to: CUPS Interface
• CMD-Shift-4 - Screen Capture Tool, Space bar switches to window at a time mode.
• No more Pop-Ups in Netscape: Add the following to the prefs.js file
  user_pref("dom.disable_open_during_load", true);
  user_pref("dom.disable_open_during_close", true);
• AppleScript Commands for Finder, don't need privs.
  Use dialog:
  osascript -l AppleScript -e 'tell Application "Finder" to display dialog "Call Frank" '
  Speak text:
  osascript -l AppleScript -e 'tell Application "Finder" to say "Call Frank" '
  Use alert:
  osascript -l AppleScript -e 'tell Application "Finder" to display alert "Call Frank" '
  
• Put filename completion back into Terminal (removed in Jaguar): % set autolist
• Backup a partition over the wire
  First things first, backup the partition to another machine:

  Run netcat on another machine where you want to store your backup:
  nc -l -p 80000 > /path/to/backups/your_image_name.img

  Now on the machine you want to backup (substitute sda1 with your partition name):

  dd if=/dev/sda1 | nc hostname_of_2nd_machine 80000

  This will transfer an image of the partition to the second machine at an incredibly fast speed (I love netcat!)

Jaguar Keystrokes

As found in MacAddict:

Key Combination               Result
Start-up Keystrokes
C                             Starts up from a CD.
D                             Starts up from the hard disk's first partition
N                             Starts up from the network server.
T                             Puts the Mac into FireWire Target Disk mode.
X                             Starts up in OS X (if OS 9 is on the same disk)
shift                         Prevents start-up items from opening
option                        Shows icons of all start-up disks or partitions
                              so you can choose one for start-up
Apple-option-shift-delete     Starts up from an external drive (or CD)
Apple-V                       Show Unix console messages during start-up.
hold mouse button down        Ejects a stuck CD or DVD

Finder Keystrokes
Apple-option-W                Closes all Finder windows.
Apple-up arrow                Opens the parent folder.
Apple-option-shift-up arrow   Selects the desktop
tab                           Selects next item alphabetically.
shift-tab                     Selects previous item alphabetically.
Apple-shift-H                 Opens your Home folder.
Apple-shift-A                 Opens your Applications folder.
option-click "Green Ball"     Minimizes all Finder windows.

General Keystrokes
Apple-tab                     Switches to the next open program - press once
                              and release the Apple key to switch to the
                              program you used most recently.
Apple-shift-tab               Switches to the previous open program
Apple-tilde                   Switches to the next open window in this prog.
option-Empty Trash            Empties the Trash without asking, "Are you sure"
Apple-option-D                Hides/shows the Dock
Apple-click on Dock icon      Reveals the original item in the Finder
Apple-option-click on Dock ic Switches to this program and hides all others
Apple-option-H                Hides all windows except the one you're in

On Keyboards w/o Power Key
control-eject                 Brings up the dialog box for shutdown/sleep/rs
Apple-control-eject           Forces a restart
Apple-option-eject            Puts the Mac to sleep
Apple-control-option-eject    Shuts down.

Rob's Keystrokes:

Command-click Directory
  name in a file browser      Brings up filesystem directory path where you
                              can select any Parent directory
option-click Dock icon        If done on current app, hides app
                              If done on different app, brings forward, 
                              and hides other applications
option-click desktop          Hides current application

OS X X11 Tricks

Generic OS X Tricks

defaults write com.apple.dashboard mcx-disabled -boolean YES

defaults write com.apple.dashboard devmode YES

defaults write com.apple.Dock showhidden -boolean YES

killall Dock

sudo pmset -a lidwake 0

sudo pmset -a hibernatemode 0

sudo nvram "use-nvramrc?"=false

Set "0" to "3", and "false" to "true", to re-enable