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I've written several entries of Terminal commands. I collected all of them inside tags named Terminal; Feel free to look at them. Since I've got brand new Terminal commands inside my collection, I would like to share inside this article.

Desktop : Login Picture

Set Login Picture

defaults write /Library/Preferences/com.apple.loginwindow DesktopPicture "/System/Library/CoreServices/Finder.app/Contents/Resources/vortex.png"

I use vortex.png for this sample command lines.

Exposé : Rounded Button

Show Button

defaults write com.apple.dock wvous-floater -bool YES
killall Dock

Hide Button

defaults write com.apple.dock wvous-floater -bool NO
killall Dock

Blue rounded button will appear on the top-right corner of the screen.

• Click on the button has the same effect as F10
• Option-Click on the button has the same effect as F9

Exposé : Semicircle Button

Enable

defaults write com.appe.dock wvous-showcorners -bool YES
killall Dock

Disable

defaults write com.appe.dock wvous-showcorners -bool NO
killall Dock

A semicircle transparent button will appear on the top-left corner of the screen. Clicking this button will turn off currently active Exposé state. It will do nothing if Exposé is not turned on.

Appearance : Recent Document

Set Limit

defaults write -g NSRecentDocumentsLimit -int 0

0 can be changed to any number.

Dock : Minimize Effect

Genie Effect

defaults write com.apple.Dock mineffect genie
killall Dock

Scale Effect

defaults write com.apple.Dock mineffect scale
killall Dock

Suck Effect

defaults write com.apple.Dock mineffect suck
killall Dock

Default Effect

defaults delete com.apple.Dock mineffect
killall Dock

Dock : Pin Point

Start Point

defaults write com.apple.dock pinning -string start
killall Dock

End Point

defaults write com.apple.dock pinning -string end
killall Dock

Middle Point (Default)

defaults delete com.apple.dock pinning
killall Dock

The effect of pin point can be seen when you scale up/down your Dock.

Safari : Auto-Open Downloads

Turn Off

defaults write com.apple.Safari AutoOpenSafeDownloads -bool NO

Turn On

defaults write com.apple.Safari AutoOpenSafeDownloads -bool YES

Use Default Setting

defaults delete com.apple.Safari AutoOpenSafeDownloads

Terminal : Opt-Click to Move Cursor

Enable

defaults write com.apple.Terminal OptionClickToMoveCursor -bool YES

Disable

defaults delete com.apple.Terminal OptionClickToMoveCursor

Appearance : Scroll Arrows

Together at Left Side

defaults write -g AppleScrollBarVariant -string DoubleMin
killall Finder

Together at Right Side

defaults write -g AppleScrollBarVariant -string DoubleMax
killall Finder

Together at Both Sides

defaults write -g AppleScrollBarVariant -string DoubleBoth
killall Finder

One for Each Side

defaults write -g AppleScrollBarVariant -string Single
killall Finder

Dock : Trash

Show Empty Trash

defaults write com.apple.dock trash-full -bool NO
killall Dock

Show Full Trash

defaults write com.apple.dock trash-full -bool YES
killall Dock

With these command lines, you will set your trash regardless the trash is currently empty or full.

Address Book : Debug Menu

Show

defaults write com.apple.addressbook ABShowDebugMenu -bool YES

Hide

defaults delete com.apple.addressbook ABShowDebugMenu

Finder : All Animations

Turn On

defaults write com.apple.finder DisableAllAnimations -bool YES
killall Finder

Turn Off

defaults delete com.apple.finder DisableAllAnimations
killall Finder

Finder : Quit Menu Item

Show

defaults write com.apple.finder QuitMenuItem -bool YES
killall Finder

Hide

defaults delete com.apple.finder QuitMenuItem
killall Finder

Finder : Snap to Grid Animation

Turn Off

defaults write com.apple.Finder AnimateSnapToGrid -bool NO
killall Finder

Turn On

defaults delete com.apple.Finder AnimateSnapToGrid
killall Finder

Safari : Tab Bar

Always Show

defaults write com.apple.Safari AlwaysShowTabBar -bool YES

Hide

defaults write com.apple.Safari AlwaysShowTabBar -bool NO

Default

defaults delete com.apple.Safari AlwaysShowTabBar

Relaunch Safari to see the effect.

Safari : Antialiasing-Smooth Font

Set High Threshold

defaults write com.apple.Safari AppleAntiAliasingThreshold -int 8
defaults write com.apple.Safari AppleSmoothFontsSizeThreshold -int 8

Set Low Threshold

defaults write com.apple.Safari AppleAntiAliasingThreshold -int 2
defaults write com.apple.Safari AppleSmoothFontsSizeThreshold -int 2

Set Default Value

defaults delete com.apple.Safari AppleAntiAliasingThreshold
defaults delete com.apple.Safari AppleSmoothFontsSizeThreshold

Security : Crash Reporter

Show Report

defaults write com.apple.CrashReporter DialogType crashreport

Turn Off

defaults write com.apple.CrashReporter DialogType none

Use Default

defaults delete com.apple.CrashReporter DialogType

I also find this free tool for OS X, CLIX, that provides handy command line interface for your Mac. CLIX also guides you through the whole process of using command lines.