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Is it possible to change the tmux prefix keyboard shortcut ctrl+B to alt+B?

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Yes. See for example this link:

set-option -g prefix M-b
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  • There is only described configuration for ctrl+A which (strangely) doesn't work for me. But I'd like to use rather alt instead of control – xralf May 11 '12 at 19:03
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    Change "c" to "m" (see the man page). – Lars Kotthoff May 11 '12 at 21:57
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    Please do not answer with just a link. Your post must stand on its own. Include the relevant information in your post, keep the link for reference. – Gilles 'SO- stop being evil' May 12 '12 at 2:50
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    The link you provided does not work – St.Antario Sep 23 '16 at 17:49
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    Works fine for me. – Lars Kotthoff Sep 23 '16 at 23:35
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Just extracted the link answered by @Lars Kotthof

Changing tmux prefix to Alt+b:

set-option -g prefix M-b
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As other have noted, you can do this by describing your favorite control sequence in e.g. the ~/.tmux.conf config file.

set-option -g prefix M-b

You can also execute this from within tmux by using the command-prompt command, ie. the current prefix and the : character, to run the set-option command interactively. I.e., type Ctrl-b then these characters, as is:

:set-option -g prefix M-b

followed by the Enter key

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