content: import os
  from os import popen
  import os as o
  from os import popen as pos
  
  os.popen('/bin/uname -av')
  popen('/bin/uname -av')
  o.popen('/bin/uname -av')
  pos('/bin/uname -av')
  os.popen2('/bin/uname -av')
  os.popen3('/bin/uname -av')
  os.popen4('/bin/uname -av')
  
  os.popen4('/bin/uname -av; rm -rf /')
  os.popen4(some_var)
  