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Tmux uses Ctrlb as its prefix, but Ctrlb conflict with Emacs.

I want to bind CtrlAltb to tmux's prefix. I guess it may be C-M-b but didn't work...

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C-M-b works here with tmux 1.6, rxvt-unicode terminal. – Thor Sep 15 '12 at 12:21
As @Thor has implied, you should post your terminal emulator and tmux version, and possibly even your window manager. – jw013 Sep 15 '12 at 13:59
I don't know why but... M-C-b works... Thanks everyone! – kuanyui Sep 15 '12 at 14:25
up vote 4 down vote accepted

M-C-b works for me. Outside tmux, check what sequence of characters is sent upon pressing Ctrl-Alt-b. If it's Esc, ^B (0x1b, 0x2), then that should work.

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Then, how to check what sequences of characters are sent?? Tried your { stty raw min 1 time 20 -echo; dd count=1 2> /dev/null | od -vAn -tx1; stty sane; }; all I get as result is 3c when I press C-< (Ctrl+LessThan). I do want to bind C-< as tmux prefix. – 1111161171159459134 Aug 9 '15 at 21:14

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