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I'd like to use ctrl-\ as the command key for tmux.

Ctrl-a and ctrl-b conflict with bash and emacs bindings.

set-option -g prefix C-\

When I start a tmux session, I get:

/Users/justin/.tmux.conf: 40: bad key: C-

This works perfectly on ubuntu, but not Mac OS Mountain Lion

If this binding won't work on the Mac, any recommendations for the best command binding?

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Reset to default
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You are probably running tmux 1.7 on your Mac, but something earlier on your other boxes (the problem is version specific, not platform specific).

In tmux 1.7 a backslash at the end of the line is treated as a line continuation (so that you can break up long commands onto multiple lines, as in most shells).

You can use quotes to protect the backslash in a way that is compatible with both versions (the syntax is different depending on whether you prefer single or double quotes):

set-option -g prefix 'C-\'
set-option -g prefix "C-\\"
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  • Thanks -- In the meantime I switched to the common C-a binding and switched bash to vi mode so I don't want to hit ctrl-a all the time. So not sure if I'll go back to ctrl-\.
    – justingordon
    Dec 20, 2012 at 22:05

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