Alt is a modifier key that is used in many keyboard shortcuts. The keycap on most keyboards spells out "Alt", although the symbol ⎇ (U+2387) may also be used.

US keyboard layouts typically have left and right Alt keys, one on either side of the space bar. Non-US keyboard layouts typically have a single Alt key to the left of the space bar, and an AltGr key to the right.

Common uses of the Alt key in Ubuntu include:

  • Alt+Tab switches to a different window.
  • Alt+F4 closes the current window.
  • Alt+mouse drag moves a window.
  • Alt+letter can be used to access the menu bar of an application; for example Alt+F opens the File menu.

See also Alt key on Wikipedia.

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