run shell have some error

[zhengkai]

https://github.com/tony/tmux-config/blob/master/.tmux.conf#L98
# {$TMUX_VERSION_MAJOR} can't get environment, $TMUX_VERSION_MAJOR is ok.

and this if-shell code should add test or [[

https://github.com/tony/tmux-config/blob/master/.tmux.conf#L105
“test 'xxx'” must be true, beacuse ‘xxx’ is string.

[stale]

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