table

Action Windows macOS[notes 1] Linux Emacs Vim ChromeOS
File menu Alt+F, or F10 then F Ctrl+F2, then F[notes 2] Alt+F Meta+`, then f Alt+f (gvim)

or Ctrl+e (vim + NERDTree)

Ctrl+O
Edit menu Alt+E Ctrl+F2, then E[notes 2] Alt+E Meta+`, then e Alt+e (gvim)
View menu Alt+V Ctrl+F2, then V[notes 2] Alt+V
Undo the last operation Ctrl+Z, or Alt+Backspace ⌘ Cmd+Z Ctrl+Z Ctrl+x, then u or

Ctrl+/ or Ctrl+_ or Undo

u Ctrl+Z
Redo the last operation Ctrl+Y, or Alt+Shift+Backspace ⇧ Shift+⌘ Cmd+Z Ctrl+⇧ Shift+Z, or Ctrl+Y
Same as undo, when undo is exhausted, it redoes. Move the cursor after one or more undos, and further undos will be redos.

Since version 28, also Ctrl+?

or Ctrl+Alt+_.

Ctrl+r Ctrl+⇧ Shift+Z
Cut the selection and store it in the clipboard Ctrl+X, or ⇧ Shift+Del ⌘ Cmd+X Ctrl+X Ctrl+w x

or "ax to cut in register “a”
or "+x to cut in system clipboard

Ctrl+X
Copy the selection into the clipboard Ctrl+C, or Ctrl+Ins ⌘ Cmd+C Ctrl+C Meta+w, or Ctrl+Ins y

or "ay
or "+y

Ctrl+C
Paste contents of clipboard at cursor Ctrl+V,or ⇧ Shift+Ins ⌘ Cmd+V Ctrl+V Ctrl+y, or ⇧ Shift+Ins p

or "ap to paste the content of the “a” register
or "+p to paste the content of the system clipboard

Ctrl+V
Paste special ⊞ Win+V Shift+Opt+Cmd+V Ctrl+⇧ Shift+V Meta+y Ctrl+⇧ Shift+V Ctrl+⇧ Shift+V
Select all in focused control or window Ctrl+A ⌘ Cmd+A Ctrl+A Ctrl+x, then h ggVG, unlikely ever needed as most commands take an optional range parameter. % means “all in focused windows” here so e.g. to copy all the text, use :%y Ctrl+A
Cycle through installed keyboard languages / input methods Alt+⇧ Shift, or ⊞ Win+Space

The latter displays a menu with the currently selected input method highlighted, and debuted in Windows 8.

Cmd+Space (not MBR)

Configure desired keypress in Keyboard and Mouse Preferences, Keyboard Shortcuts, Select the next source in Input menu.[1]

Ctrl+Alt+K via KDE Keyboard

Alt+⇧ Shift in GNOME

Ctrl+\ Ctrl+Space
Print Ctrl+P ⌘ Cmd+P Ctrl+P Ctrl+P
Open Help Menu F1 in GNOME Ctrl+Alt+/
Windows Mobility Center Windows 7: ⊞ Win+x

Windows 10: ⊞ Win+xb

PowerUser (WinX) Menu Windows 10: ⊞ Win+x
Restart Video Driver Windows 10: Ctrl+⇧ Shift+⊞ Win+B[2][3]