USAGE: tmux-save-scrollback.sh 2 200

tmux-save-scrollback.sh

#!/bin/bash

declare -r ES_BOLD=$(tput bold)
declare -r ES_NORM=$(tput sgr0)
declare -r DEFAULT_SCROLLBACK=9999
declare -r MIL_TIME_NOW=$(date +'%Y-%m-%d-%H-%M-%S')
declare -r TARGET_PANE=$1
declare -r SCROLLBACK_COUNT=$2

function main {
  set -eu
  if [ -z "$TARGET_PANE" ]; then
    echo "You need to pass a target pane (tmux pane starts from 1)"
  fi
  local scroll_back=${SCROLLBACK_COUNT:-$DEFAULT_SCROLLBACK}

  tmux capture-pane -p -C -t $TARGET_PANE -S -$scroll_back > $MIL_TIME_NOW.txt
  echo "Pane $TARGET_PANE is saved as $ES_BOLD$MIL_TIME_NOW.txt$ES_NORM"
}

# ====

main