What to work fast in Mac Os X? Then know these keyboard shortcuts to operate at lightening speed.Apple’s keyboard comes with Command key(With Apple Logo) as you see in picture above.
Clipboard
Command+C = Copy
Command+V = Paste
Command+X = Cut
Command+A = Select All
Screen capture
Command+Shift 3 = Capture the screen to a file
Command Ctrl Shift 3 = Capture the screen to the clipboard
Command+Shift 4 = Select an area to be captured to a file
Command Ctrl Shift 4 = Select an area to be captured to the clipboard
Command+Shift 4+ Space = Capture entire window
Start up hot+keys
X = Force Mac OS X startup
C = Start up from a bootable CD
N = Attempt to start up from a compatible network server (NetBoot)
T = Start up in FireWire Target Disk mode
Opt+Command+Shift+Delete = Seeks a different startup volume
Shift = Start up in Safe Boot mode
Command+V = Start up in Verbose mode
Command+S = Start up in Single+User mode
Command+Opt+Esc = Force Quit menu
Command+Opt+D = Show/hide the dock
Ctrl+Eject = Bring up Shutdown/Sleep/Logout Dialog
Ctrl+Command+Eject = Restart immediately
Finder Navigation
Command+N = New Finder window
Command+W = Close Window
Opt+Command+W = Close all Windows
Command+Down = Open File/Folder
Command+Up = Navigate to parent
Command+Right = Expand folder (in list view)
Command+Left = Collapse Folder (in list view)
Opt+Command+Right = Expand folder and its subfolders (in list view)
Opt+Command+Up = Open parent folder and close current window
Command+Shift+H = Jump to your Home folder
Command+Shift+A = Jump to your Applications folder
Command+Shift U = Jump to your Utilities folder
Command+Shift K = Jump to the Network browser
Command+Shift G = Goto Folder…
Command+1 = View as Icons
Command+2 = View as List
Command+3 = View as Columns
Command+Space = Open Spotlight
Command+Delete = Move file/folder to trash
Command+Click window title = Display the file path
Menu Commands
Shift+Command+Q = Log out
Shift+Opt+Command+Q = Log out immediately
Shift+Command+Delete = Empty Trash
Opt+Shift+Command+Delete = Empty Trash without dialog
Command+H = Hide window
Opt+Command+H = Hide Others
Command+N = File New window
Shift+Command+N = New Folder
Command+O = Open
Command+S = Save
Shift+Command+S = Save as
Command+P = Print
Command+W = Close Window
Opt+Command+W = Close all Windows
Command+I = Get Info
Opt+Command+I = Show Attributes Inspector
Command+D = Duplicate
Command+L = Make Alias
Command+R = Show original
Command+T = Add to Favorites
Command+Delete = Move to Trash
Command+E = Eject
Command+F = Find
Command+Z = Undo
Command+B = Hide Toolbar
Command+J = Show View Opts
Command = [ = Go Back
Command = ] = Go Forward
Shift+Command+C = Go to Computer
Shift+Command+H = Go to your Home folder
Shift+Command+I = Go to iDisk
Shift+Command+A = Go to Applications folder
Shift+Command+G = Go to Go+To Folder
Command+K = Connect to Server
Command+M = Minimize Window
Command+? = Open Mac Help
Command+Space = Open Spotlight
Universal Access
Opt+Command+* = Turn on Zoom
Opt+Command++ = Zoom in
Opt+Command– (minus) = Zoom out
Command+Opt+Ctrl+8 = Invert Screen colors
Window Management
Command+W = Close window
Command+Opt+W = Close all windows
Command+M = Minimise window
Command+Opt+M = Minimise all windows
Command+H = Hide Application
Command+~ = Cycle through windows for current application
Ctrl+F4 = Cycle through every open window
Command+Tab = Bring up the Application Switcher.
Command+Tab = Cycle Forwards
Command+~ = Cycle Backwards
Command+Shift+Tab = Cycle Backwards
Command+Q = Quit application
Expose
F9 = Show all open windows on the screen at once
F10 = Show all windows for the current application.
F11 = Shows Desktop
F12 = Activates Dashboard
F12 (hold) = ejects disk
Miscellaneous
Opt+Command+D = Show/Hide Dock
Ctrl+Up = Move up one page
Ctrl+Down = Move down one page
Opt+Drag = Copy to new location
Opt+Command+Drag = Make alias in new location
Command+Drag = Move to new location without copying
Opt+Command+Eject = Sleep
Also checkout, Keyboard shortcuts for Windows
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