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Under screen, I used: bindkey , command to use the comma as the prefix instead of Ctrla.

If I do set -g prefix in tmux, it complains saying: unkown key

At first, I believed that tmux did not support single keys as prefix, However, I managed to use \ as a prefix successfully!

How can I do so for the ,?

[Edit] Apparently this works under tmux 1.6, haven't tried it though. Thx jasonwryan for the hint :)

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This works in tmux 1.6: set -g prefix , –  jasonwryan Mar 17 '12 at 19:04
Ah, I have tmux 1.5 that should explain it then :) Thx ^^ –  Turgon Mar 18 '12 at 10:36

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