code: def inall_cmd(argv):
      
      envs = lsenvs()
      errors = False
      for env in envs:
          print("\n%s:" % env)
          try:
              inve(env, *argv)
          except CalledProcessError as e:
              errors = True
              err(e)
      sys.exit(errors)
docs: Run a command in each virtualenv.