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Tmux could not connect to server error on `tmux ls` if no sessions are running

Just by writing a quick loop to list existing tmux sessions when logging into the server, depending on if tmux is installed (via .bashrc on CentOS).

if rpm -q tmux; then
    echo -e "TMUX sessions running:\n"
    echo `tmux ls`
fi

This works great when tmux has a session or two, but if there are no tmux sessions running, I get failed to connect to server: No such file or directory

.

Is there a way to suppress this?

Thank!

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2 answers


Using a combination of tips from @Barmar and @Etan Reisner:

tmux ls 2> /dev/null


Doesn't repeat anything when there are no sessions, otherwise the list is reported.

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Note that you can start the tmux server, but you cannot connect to it because someone cleared out the directory /tmp

and took the server socket with it.

In this case, you can tell the server to recreate the socket by sending it a SIGUSR1 signal.



% ps aux | grep -w [t]mux
root     14799  0.2  0.0  36020   488 ?        Ss   May08  51:30 tmux
% kill -USR1 14799
% tmux ls
<list of tmux sessions>
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