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ActionWindowsmacOS
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General Shortcuts
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File menuAlt+F OR F10 then FCtrl+F2, then F
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Edit menuAlt+ECtrl+F2, then E
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View menuAlt+VCtrl+F2, then V
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Undo the last operationCtrl+Z OR Alt+Backspace⌘Cmd+Z
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Redo the last operationCtrl+Y OR Shift+Alt+Backspace⌘Cmd+Y
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Cut the selection and store it in the clipboardCtrl+X OR ⇧ Shift+Del⌘ Cmd+X
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Copy the selection into the clipboardCtrl+C OR Ctrl+Ins⌘ Cmd+C
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Paste contents of clipboard at cursorCtrl+V OR ⇧ Shift+Ins⌘ Cmd+V
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Paste specialCtrl+VShift+Opt+Cmd+V
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Select all in focused control or windowCtrl+A⌘ Cmd+A
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Cycle through installed keyboard languages / input methods⇧ Shift+Alt OR ⊞ Win+Space

(NOTE: The latter displays a menu with the currently selected input method highlighted, and debuted in Windows 8.)
Cmd+Space

(NOTE: Configure desired keypress in Keyboard and Mouse Preferences, Keyboard ShORtcuts, Select the next source in Input menu.)
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Navigation
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New browser window with same page as currentCtrl+N

(NOTE: For both explorer.exe and iexplore.exe)
⌘ Cmd+T
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New folderCtrl+⇧ Shift+N⇧ Shift+⌘ Cmd+N
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Applications menu⊞ Win OR Ctrl+EscCtrl+F2, then N
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Lock desktop⊞ Win+LCtrl+⌘ Cmd+Q (for macOS High Sierra and greater) OR Ctrl+⇧ Shift+Eject OR
MBR Ctrl+⇧ Shift+Pwr (if "Require password after sleep or screen saver" is enabled in "System Preferences — Security & Privacy")
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Show desktop⊞ Win+DF11
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Minimize all windows⊞ Win+M, then ⊞ Win+⇧ Shift+M to bring back all windows
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Log out user⇧ Shift+⌘ Cmd+Q
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Switch active user⊞ Win+L
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Task managerCtrl+⇧ Shift+Esc⌥ Opt+⌘ Cmd+Esc
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Rename objectF2↵ Enter OR F2
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Open file OR program↵ Enter OR ⇧ Shift+↵ Enter⌘ Cmd+O OR ⌘ Cmd+↓
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Switch window (next/previous)Alt+Tab ↹ / ⇧ Shift+Alt+Tab ↹⌘ Cmd+Tab ↹ / ⇧ Shift+⌘ Cmd+Tab ↹
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Switch window without dialog (next/previous)Alt+Esc / ⇧ Shift+Alt+Esc⌘ Cmd+` / ⌘ Cmd+~

(NOTE: Only works within single Applications)
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Run application⊞ Win, enter executable name OR
⊞ Win+R, enter executable name
⌘ Cmd+Space, enter executable name OR ⌘ Cmd+↓
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Search⊞ Win, enter executable name OR
⊞ Win+F OR F3
⌘ Cmd+Space
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Show Hidden Files⇧ Shift+⌘ Cmd+.

(NOTE: While in Finder, will toggle setting)
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Power Management
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Place computer into sleep/standby modeWindows 10: ⊞ Win+x > u > s Windows 7: ⊞ Win+→+→+↵ Enter⌥ Opt+⌘ Cmd+Eject
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Windows task managerCtrl+⇧ Shift+Esc
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Shut down computerWindows 10: ⊞ Win+x > u > uCtrl+⌥ Opt+⌘ Cmd+Eject

(NOTE: No confirmation, shutdown is immediate)
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Restart computer⊞ Win+x > u > r (Windows 10) OR
⊞ Win+→+→+↑+↵ Enter (Windows 7 & 8)
Ctrl+⌘ Cmd+Eject

(NOTE: No confirmation, restart is immediate)
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Place display in sleep modeButton on monitorCtrl+⇧ Shift+Eject
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Bring up power/sleep dialog box⊞ Win+D, then Alt+F4Ctrl+Eject
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Force shutdownHold Power (5 seconds)⌥ Opt+⌘ Cmd+Eject
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Screenshots
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Save screenshot of entire screen as file⊞ Win+Print Screen⇧ Shift+⌘ Cmd+3
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Copy screenshot of entire screen to clipboard⊞ Win+Print Screen OR Print ScreenCtrl+⇧ Shift+⌘ Cmd+3
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Copy screenshot of active window to clipboardAlt+Print Screen
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Save screenshot of window as file⇧ Shift+⌘ Cmd+4, then Space, then move mouse and click
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Save screenshot of arbitrary area as file⇧ Shift+⌘ Cmd+4, then click+drag mouse over required area
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Copy screenshot of window to clipboardCtrl+⇧ Shift+⌘ Cmd+4, then Space, then move mouse and click
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Copy screenshot of arbitrary area to clipboardWindows 10: ⊞ Win+⇧ Shift+SCtrl+⇧ Shift+⌘ Cmd+4, then click+drag mouse over required area
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Text Editing
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Delete char to the right of cursorDel OR Fn+← BackspaceDel OR Fn+← Backspace
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Delete word to the right of cursorCtrl+Del⌥ Opt+Del OR ⌥ Opt+Fn+← Backspace
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Delete word to the left of cursorCtrl+← Backspace⌥ Opt+← Backspace
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Go to start of lineHome OR Fn+←⌘ Cmd+← OR Ctrl+A
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Go to end of lineEnd OR Fn+→⌘ Cmd+→ OR Ctrl+E
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Go to start of documentCtrl+Home⌘ Cmd+↑
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Go to end of documentCtrl+End⌘ Cmd+↓
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Go to previous wordCtrl+← OR Ctrl+/⌥ Opt+←
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Go to next wordCtrl+→⌥ Opt+→
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Go to previous lineOR Ctrl+p
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Go to next lineOR Ctrl+n
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Go to previous line break (paragraph)Ctrl+↑⌥ Opt+↑
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Go to next line breakCtrl+↓⌥ Opt+↓
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Move the cursor down the length of the viewportPage Down⌥ Opt+⇟ OR ⌥ Opt+Fn+↓
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Move the cursor up the length of the viewportPage Up⌥ Opt+⇞ OR ⌥ Opt+Fn+↑
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FindCtrl+F⌘ Cmd+F OR ⌘ Cmd+E

(NOTE: Latter searches within current selection)
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Go to next search resultF3⌘ Cmd+G
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Go to previous search result⇧ Shift+F3⇧ Shift+⌘ Cmd+G
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Search and replaceCtrl+H⌘ Cmd+F
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Text Formatting
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BoldCtrl+B⌘ Cmd+B
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UnderlineCtrl+U⌘ Cmd+U
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ItalicCtrl+I⌘ Cmd+I
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Uppercase / Lowercase⇧ Shift+F3 OR Ctrl+⇧ Shift+A⌥ Opt+⌘ Cmd+C
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SuperscriptCtrl+⇧ Shift+=Ctrl+⌘ Cmd++

(NOTE: Some applications only)
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SubscriptCtrl+=Ctrl+⌘ Cmd+-

(NOTE: Some applications only)
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Selected text larger/smallerCtrl+⇧ Shift+> / Ctrl+⇧ Shift+< OR
Ctrl+[ / Ctrl+]
⌥ Opt+⇧ Shift+> / ⌥ Opt+⇧ Shift+<
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Selected text Bullets or Numbered ItemsCtrl+⇧ Shift+L
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Insert Linebreak⇧ Shift+↵ Enter⌥ Opt+↵ Enter
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Browsers/Go Menu
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Go to Address BarAlt+D OR Alt+C OR F6

(NOTE: Depends on language)
⌘ Cmd+L OR ⇧ Shift+⌘ Cmd+G
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Go to the previous location in historyAlt+← OR ← Backspace⌘ Cmd+[ OR ⌘ Cmd+←
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Go to the next location in historyAlt+→ OR ⇧ Shift+← Backspace

(NOTE: Web browsers only)
⌘ Cmd+] OR ⌘ Cmd+→
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Go up one level in the navigation hierarchyAlt+↑ (Windows Vista, 7 or 8) OR
← Backspace (Windows Explorer)
⌘ Cmd+↑
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Go to the starting page defined by the user or applicationAlt+Home⌘ Cmd+Home
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Web Browsers
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Bookmarks menuCtrl+B⌘ Cmd+B (Firefox)
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URL Shortcuts (Adds www. + .com)↵ Enter⌘ Cmd+↵ Enter (Firefox) OR
Ctrl+↵ Enter (Chrome)
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URL Shortcuts (Adds www. + .org)Ctrl+⇧ Shift+↵ Enter⇧ Shift+⌘ Cmd+↵ Enter (Firefox)
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URL Shortcuts (Adds www. + .net)⇧ Shift+↵ Enter⇧ Shift+↵ Enter (Firefox)
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Add bookmark for current pageCtrl+D⌘ Cmd+D
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Manage bookmarksCtrl+B⌘ Cmd+⌥ Opt+B (Chrome/Safari) OR ⌘ Cmd+⇧ Shift+B (Firefox)
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Focus and select Web search barCtrl+E⌘ Cmd+E (Opera) OR ⌘ Cmd+K (Firefox) OR ⌥ Opt+⌘ Cmd+F (Safari)
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Focus and select address barCtrl+L OR F6 OR Alt+D⌘ Cmd+L
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Refresh a webpageF5 OR Ctrl+R⌘ Cmd+R
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Refresh a webpage ignoring cacheCtrl+F5 OR Ctrl+⇧ Shift+R⌥ Opt+⌘ Cmd+E, then ⌘ Cmd+R