Open variations of a command in multiple iTerm2 panes. Works with bash and zsh.

multicom.sh

multicom () {
  echo Usage: multicom command arg1 arg2 arg3 arg4...
  echo e.g. multicom "ssh %s" web1 web2 web3
  echo

  read -r -d '' code <<-APPLESCRIPT
    activate application "iTerm"
    tell application "System Events" to keystroke "n" using command down
APPLESCRIPT

  command=${@:1:1}
  echo $command
  i=0
  for comarg in ${@:2}; do

    key=d
    # Open a new tab every 3 panes
    ((i+=1))
    if [ $((i%3)) -eq 0 ]; then
      key=t
    fi

    read -r -d '' code <<-APPLESCRIPT
      $code
      tell application "iTerm" to tell session -1 of current terminal to write text "$(printf "$command" $comarg)"
      tell application "System Events" to keystroke "$key" using command down
APPLESCRIPT
  done

  echo "$code"
  osascript -e "$code"
}