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Run an interactive CLI/TUI app in tmux, send it input, and read its output. Use to test interactive apps.
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| name | tui-testing |
| description | Run an interactive CLI/TUI app in tmux, send it input, and read its output. Use to test interactive apps. |
Use a detached tmux session to drive any interactive app.
S=test # session name
# start the app
tmux new-session -d -s "$S" -x 200 -y 50 'your-command --args'
# send input (text)
tmux send-keys -t "$S" 'hello world' Enter
# send special keys
tmux send-keys -t "$S" Escape
tmux send-keys -t "$S" C-c # ctrl-c
tmux send-keys -t "$S" Down Down Enter
# read visible screen (add -e to keep ANSI colors)
tmux capture-pane -pt "$S"
# read full scrollback
tmux capture-pane -pt "$S" -S -
# kill the session when done
tmux kill-session -t "$S"
sleep 0.5 or poll.until tmux capture-pane -pt "$S" | grep -q 'ready'; do sleep 0.3; done
tmux attach -t "$S" (Ctrl+B then D to detach).tmux ls, tmux kill-server.sleep; a C-l
redraw will not force a paint that hasn't happened yet.kill-session. If you start
the app through a shell wrapper (sh -c …, fish -c …, env … node …),
tmux kill-session may reap only the wrapper and leave the actual child
running — causing a second live instance, lock contention, or port conflicts
on the next launch. After killing, confirm it's gone and pkill -f the command
as a fallback:
tmux kill-session -t "$S" 2>/dev/null
pkill -f 'your-command --args' 2>/dev/null