iTerm2 example script (save in `~/Library/Application Support/iTerm2/Scripts/test.scpt`, trigger with `Scripts --> test.scpt` in iTerm2)

test.scpt

tell application "iTerm"
  tell current session of current window
    split vertically with default profile
    split vertically with default profile
  end tell
  tell first session of current tab of current window
    write text "cd ~/somewhere"
    write text "run some command"
  end tell
  tell second session of current tab of current window
    write text "cd ~/somewhere"
    write text "run some command"
  end tell
  tell third session of current tab of current window
    write text "cd ~/somewhere"
    write text "run some command"
  end tell
end tell