text: #!/usr/bin/python3
  import sys, os, pwd
  
  if len(sys.argv) < 3:
      sys.stderr.write("Usage: /sbin/setuser USERNAME COMMAND [args..]\n")
      sys.exit(1)
  
  def abort(message):
      sys.stderr.write("setuser: %s\n" % message)
      sys.exit(1)
  
  username = sys.argv[1]
  try:
      user = pwd.getpwnam(username)
  except KeyError:
      abort("user %s not found" % username)
  os.initgroups(username, user.pw_gid)
  os.setgid(user.pw_gid)
  os.setuid(user.pw_uid)
  os.environ['USER'] = username
  os.environ['HOME'] = user.pw_dir
  os.environ['UID']  = str(user.pw_uid)
  try:
      os.execvp(sys.argv[2], sys.argv[2:])
  except OSError as e:
      abort("cannot execute %s: %s" % (sys.argv[2], str(e)))