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4.3 Colon

Customization can also be done online, with this command:

— Command: colon

(C-a :)
Allows you to enter .screenrc command lines. Useful for on-the-fly modification of key bindings, specific window creation and changing settings. Note that the set keyword no longer exists, as of version 3.3. Change default settings with commands starting with ‘def’. You might think of this as the ex command mode of screen, with copy as its vi command mode (see Copy and Paste).