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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.

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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
Change "c" to "m" (see the man page). –  Lars Kotthoff May 11 '12 at 21:57
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 May 12 '12 at 2:50
Thanks for m advice. It already works. –  xralf May 12 '12 at 9:11

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