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I'm writing a script. I really want to know this. I hope tmux executable can tell me this.

I find

tmux rename <newname>

can rename current session. But I can't find a command to fetch its own name.

Thank you.

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up vote 18 down vote accepted

With tmux 1.2 (and later), you can use the -p option of display-message to output a message to stdout (instead of displaying it to an attached client):

tmux display-message -p '#S'

#S is formatted as the session name (see the description of the status-left option in the man page).

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+1, much better than my answer. – chepner Apr 9 '12 at 12:52
I really appreciate that you point out it require tmux 1.2, which is exactly the version available for openSUSE 11.3 auto online update. – Jimm Chen Apr 10 '12 at 1:19

Not ideal, but you can extract the name of the attached session with awk:

tmux list-sessions -F '#{session_name} #{session_attached,yes,}' | awk '$2=="yes" {print $1}'

The custom format is a little easier to parse than the default.

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