tmux, launch_msg(): Socket is not connected about prezto HOT 5 CLOSED

It's telling tmux to launch a login shell. I remember that error. It believe it's a tmux bug. You'll have to google.

By the way, tmux is pretty buggy. I had the thing crash OS X multiple times with kernel panics. I had to power cycle the machine.

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Yes, I've already done my research. It doesn't seem to be due to tmux (well, not entirely), but to launch_ctl .
I know it's to start a login shell, but I wonder if it's important to force it.

The documentation states that by default, default-command is executed, and if default-command isn't set

The default is an empty string, which instructs tmux to create a login shell
using the value of the default-shell option.

And by default, default-shell

When started tmux tries to set a default value from the first suitable of the SHELL environment variable,
the shell returned by getpwuid(3), or /bin/sh.

So that's basically what tmux is already doing.

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Ok. Then I suppose it's safe to remove. The screen plugin was written first and the tmux plugin is based on it.

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Just, more information on the issue: https://github.com/ChrisJohnsen/tmux-MacOSX-pasteboard

If you don't use this reattach-to-user-namespace you will still have the issue.
Right now I have

set-option -g default-command "reattach-to-user-namespace -l $SHELL -l"

in my .tmux.conf and it works fine.

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Right, I use that to make pbcopy/pbpaste work. How does it behave on Linux?

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