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sumonst21/tmux-copy-to-file-using-ctrl-space.md

Created June 8, 2025 22:55
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tmux copy-mode to file (Termius on Windows, Debian server)
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tmux-copy-to-file-using-ctrl-space.md

tmux copy-mode to file (Termius on Windows, Debian server)

If you can’t visually highlight with plain Space (Termius sends Ctrl+Space), and want to save tmux copy-mode selection to a file, do this:

Setup inside tmux:

  1. Press Ctrl+b then :
  2. Paste these lines one by one, pressing Enter after each:
set -g mode-keys vi
bind -T copy-mode-vi C-Space send -X begin-selection
bind -T copy-mode-vi y send -X copy-pipe-and-cancel "tee /tmp/tmux-out.txt >/dev/null"

How to use:

  • Ctrl+b then [
  • Move to start of text to copy
  • Press Ctrl+Space to begin selection
  • Move cursor to end of text
  • Press y (no Enter) and wait till cursor returns to normal (time varies based on selection size), copy-mode will exit automatically
  • The copied text is saved to /tmp/tmux-out.txt
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