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Until a few days ago, tmux was working fine.

Suddenly, I don't know what my colleague did, but the shortcuts stopped working.

We're both using tmux on a remote server (two different sessions), but no session works now.

I mean, we can attach them (tmux a -t name works), but then, the shortcut doesn't work.

If I do Ctrl + a, d, it just writes d to the terminal. I tried with the original shortcut (Ctrl + b) but no change.

My tmux.conf is clearly taken into account, since if I do tmux new -s someName, I get all the status bar and stuff. The initialization shortcut doesn't work however.

Any idea of what could cause this?

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What does tmux list-keys show? – cYrus Jul 24 '12 at 9:29
@cYrus The normal list of shortcuts available. What's not working in tmux is the "Enable tmux commands" shortcut, whatever it's called. Do you want a copy paste of tmux list-keys? – Florian Margaine Jul 24 '12 at 9:31
If that list contains the shortcuts that you're expecting that's ok. Just check for the usual set-option -g prefix C-a in your configuration file. – cYrus Jul 24 '12 at 9:41
I checked it, and it's ok. This conf worked fine until a few days ago... – Florian Margaine Jul 24 '12 at 10:14
@cYrus If you're interested, I added an answer to add the debugging commands I used :-) – Florian Margaine Jul 24 '12 at 12:08
up vote 6 down vote accepted

Thanks to @ccxCZ on, I could find what was the problem.

Using the following:

tmux show-options -g | grep prefix

Showed me that the prefix was:

prefix `

Testing it, it was indeed this. I don't know how it turned out this way.

Since my tmux.conf was right, I just had to do:

tmux source /etc/tmux.conf

And the prefix was set back to the right way.

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