Tmux Controls

Listing Sessions, Windows, and Panes

tmux list-sessions -F '#{session_name}'
tmux list-windows -a -F '#{session_name}:#{window_index} #{window_name}'
tmux list-panes -a -F '#{session_name}:#{window_index}.#{pane_index} #{pane_id} #{pane_active} #{pane_current_command}'

Capturing Scrollback

Log Watching

# Last 2000 lines
tmux capture-pane -t agent:main.0 -p -S -2000 -J

# Search for errors
tmux capture-pane -t agent:main.0 -p -S -50000 -J | rg 'ERROR|FATAL'

Failure Triage

# Most recent READY
tmux capture-pane -t agent:main.0 -p -S -50000 -J | tac | rg -m1 'READY'

# Capture with 2 lines context
tmux capture-pane -t agent:main.0 -p -S -50000 -J | rg -C2 'failed|timeout'

Report Building

# Extract block between sentinels
tmux capture-pane -t agent:main.0 -p -S -50000 -J | rg -U -o 'BEGIN<<[\s\S]*?>>END'

Finding Panes by Content

# Find panes containing a keyword
tmux list-panes -a -F '#{session_name}:#{window_index}.#{pane_index}' | \
  xargs -I{} sh -c 'tmux capture-pane -t {} -p -S -5000 -J | rg -q "KEYWORD" && echo {}'

# Match by running command
tmux list-panes -a -F '#{pane_id} #{pane_current_command}' | rg '\s(node|python)$'

Creating Windows and Panes

# New window & split
tmux new-window -t agent -n work
tmux split-window -t agent:work -h

# Send keys to pane
tmux send-keys -t agent:work.0 'echo hello' C-m

capture-pane Flags Reference