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I am currently running tmux within Terminal.app on my Mac.

When I execute a command that outputs a line longer than the available window, instead of wrapping onto the next line, it overwrites the existing line.

What is also strange about this is: if I CMD+TAB to a different application and CMD+TAB back the output appears correctly on multiple lines.

How do I resolve this?

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    make sure you are not overriding TERM=screen inside tmux. – meuh Oct 5 '16 at 11:33
  • Can you reproduce this without any of your configuration files (.tmux.conf, .zshrc, etc.)? (It may help to test on another account that isn't customized in any way.) If not, post a complete set of configuration files that reproduces the problem. – Gilles Oct 7 '16 at 6:20
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I answered this last May in

Why does tmux fail to “scroll” when entering a command that exceeds one line? (OSX Terminal.app)

It is a known bug which does not appear with iTerm2.

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