Mac Os X shortcuts

This should be nothing new but its a good reminder when often switching operating system interfaces.

Finder window

• "Command-W" = Close Window
  
• "Option-Command-W" = Close all Windows
  
• "Command-Right Arrow" = Expand folder (list view)
  
• "Option-Command-Right Arrow" = Expand folder and nested subfolders (list view)
  
• "Command-Left Arrow" = Collapse Folder (list view)
  
• "Option-Command-Up Arrow" = Open parent folder and close current window
  

Menu Commands

• "Command-H" = Finder Menu Hide Finder
  
• "Option-Command-H" = Finder Menu Hide Others
  
• "Command-N" = File Menu New Finder window
  
• "Shift-Command-N" = File Menu New Folder
  
• "Command-O" = File Menu Open
  
• "Command-S" = File Menu Save
  
• "Shift-Command-S" = File Menu Save as
  
• "Command-P" = File Menu Print
  
• "Command-W" = File Menu Close Window
  
• "Option-Command-W" = File Menu Close all Windows
  
• "Command-I" = File Menu Get Info
  
• "Command-D" = File Menu Duplicate
  
• "Command-R" = File Menu Show original
  
• "Command-T" = File Menu Add to Favorites
  
• "Command-Delete" = File Menu Move to Trash
  
• "Command-E" = File Menu Eject
  
• "Command-F" = File Menu Find
  
• "Command-Z" = Edit Menu Undo
  
• "Command-X" = Edit Menu Cut
  
• "Command-C" = Edit Menu Copy
  
• "Command-V" = Edit Menu Paste
  
• "Command-A" = Edit Menu Select All
  
• "Command-1" = View Menu View as Icons
  
• "Command-2" = View Menu View as List
  
• "Command-3" = View Menu View as Columns
  
• "Command-B" = View Menu Hide Toolbar
  
• "Shift-Command-C" = Go Menu Computer
  
• "Shift-Command-H" = Go Menu Home
  
• "Shift-Command-I" = Go Menu iDisk
  
• "Shift-Command-A" = Go Menu Applications
  
• "Shift-Command-F" = Go Menu Favorites
  
• "Shift-Command-G" = Go Menu Goto Folder
  
• "Command-K" = Go Menu Connect to Server
  
• "Command-M" = Window Menu Minimize Window
  
• "Command-?" = Help Menu Open Mac Help
  
• "Command-Space" = Open Spotlight (Mac OS X 10.4 or later)
  
• "Command-Alt-Space" = Open Spotlight Guide (Mac OS X 10.4 or later)
  
• "F12" = Opens Dashboard (Mac OS X 10.4 or later)
  

Mouse Keys

• Control-click to simulate right-click with pad
  
• "8" = Move Up
  
• "2" = Move Down
  
• "4" = Move Left
  
• "6" = Move Right
  
• "1, 3, 7, 9" = Move Diagonally
  
• "5" = Press Mouse Button
  
• "0" = Hold Mouse Button
  
• ". (period on keypad)" = Release Mouse Button (use after pressing 0)

Text

• "Control-Command-D" = Word definition in a cocoa application
  
• "Option←" = move 1 word right
• "Option→" = move 1 word left
  
• "Command←" = move to beginning of line
• "Command→" = move to end of line
• "Control-A" = move to beginning of paragraph
• "Control-K" = delete text to the end of paragraph
  
• "Control-N" = move to next line
  
• "Control-O" = insert new line
  
• "Control-T" = transpose character
  
• "Option-Delete" = delete word to the left
  

Terminal

• "Control-A" = move to beginning of line
• "Control-B/F" = move back/forward one character
  
• "Control-E" = move to the end of line
• "Control-T" = transpose char
  
• "Control-U" = Erase line
  
• "Control-W" = Erase previous word
• "Escape-F/B" = move one word forward/backward
• "Escape-D" = Erase next word

Other Commands

• "Option-Command-D" = Show/Hide Dock
  
• "Command-Tab" = Switch application
  
• "Command-Up Arrow" = Move up one directory
  
• "Command-Down Arrow" = Move down one directory
  
• "Page Up or Control-Up Arrow" = Move up one page
  
• "Page Down or Control-Down Arrow" = Move down one page
  
• "Option-Drag" = Copy to new location
  
• "Command-Drag" = Move to new location without copying
  
• "Command-C" = Show Colors palette in application
  
• "Command-T" = Show Font palette in application
  
• "Command-Shift-3" = Take a picture of the screen
  
• "Command-Shift-4" = Take a picture of the selection
  
• "Command-Shift-4, then press Control while selecting" = Take a picture of the screen, place in Clipboard
  
• "Command-Shift-4, then Spacebar" = Take a picture of the selected window
• "Command -Q" = Quit Application
  
• "Option-Command-esc" = Force Quit
  
• "Control-Eject" = Restart, Sleep, Shutdown dialog box
  
• "Control-Command-Eject" = Quit all applications and restart
  
• "Option-Command-Eject or Option-Command-Power" = Sleep
  
• "Command-`" = Cycle through windows in application or Finder (if more than one window is open)
  
• "Function-Delete (PowerBook, iBook only)" = Forward Delete (delete the character to the right of your cursor)

References:
docs.info.apple.com
keyboard_shortcuts_in_os_x
rixstep