Script for safe editing of ipfw rules on FreeBSD using tmux

scratch.sh

#!/bin/sh

# What it does:
#  - Start tmux
#  - Divide the term window into two panes:
#     * small lower pane that runs "sleep 60; sudo ipfw disable firewall",
#     * large upper pane with a shell in it.
#
# Do your dangerous IPFW work in the upper pane.
# When done, switch to lower pane (Crtl-B, down arrow) and kill it with Ctrl-C

if [ x$1 = 'xsafety' ]; then
  echo "in 60 sec the fw will be disabled"
  echo "ctrl-B, up/down arrow to use other pane"
  echo "sleep 60..."
  sleep 60
  sudo ipfw disable firewall
  exit
fi

tmux new-session -s ipfw -d
tmux split-window -t ipfw -v -l 6 "sh scratch.sh safety; read"
tmux select-pane -t ipfw -U
tmux att -t ipfw