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6
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    The -p argument outputs to stdout instead of a tmux buffer. Commented Dec 1, 2019 at 6:24
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    If you are aren't in a local console this won't work so what I've tried is the following: 1) add a horizontal pane below 2) in the local shell, tmux capture-pane -t {top} -pS -1000 > ~/tmp.out Commented Jul 27, 2020 at 13:57
  • 5
    On my tmux (2.6-3ubuntu0.2), you can use -S- to capture all the available history in the pain: tmux capture-pane -p -S- > /tmp/output.txt. First-hand source (I think): man7.org/linux/man-pages/man1/tmux.1.html#COMMANDS, "-S and -E specify the starting and ending line numbers [...] ‘-’ to -S is the start of the history" Commented Mar 14, 2021 at 19:21
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    Ah, also useful: Use -J so that wordwrapping in your buffer is removed when dumped to a file, caveat is training spaces, so sed can help. Full cmd: tmux capture-pane -p -J -S- | sed -E 's# +$##g' > /tmp/output.txt Commented Mar 24, 2021 at 21:42
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    @EricCousineau do you understand why -J adds trailing spaces? That is really a shame, I wish I could avoid seding all of them out in case there are actual trailing spaces in the output. Commented Apr 25, 2022 at 11:08