content: import os, sys
  from pathlib import Path
  import subprocess
  
  def S(cmd, trace=False):
      if type(cmd) == list:
          cmd = ' '.join(cmd)
      if trace:
          print(cmd)
      return os.system(cmd)
  
  def SC(cmd):
      proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
      [out, err] = proc.communicate()
      return (out, err, proc)
  
  def A(args, q=0, i=0):
      if type(args) == list:
          if i == 1:
              args = ' '.join([f"'{a}'" for a in args])
          elif i == 2:
              args = ' '.join([f'"{a}"' for a in args])
          elif i == 3:
              args = ' '.join([f'\\"{a}\\"' for a in args])
          else:
              args = ' '.join([str(a) for a in args])
      if q == 1:
          return f"'{args}'"
      elif q == 2:
          return f'"{args}"'
      return str(args)
  
  def p(path_str):
      return Path(path_str).expanduser()
  
  def eprint(*args, **kwargs):
      print(*args, file=sys.stderr, **kwargs)
  
  def eeprint(*args, **kwargs):
      return_code=1
      if 'return_code' in kwargs:
          return_code = kwargs['return_code']
          del kwargs['return_code']
      print(*args, file=sys.stderr, **kwargs)
      sys.exit(return_code)
  
  if __name__ == '__main__':
      print('Example')
      [o, e, p] = SC('ls')
  
      if p.returncode == 0:
          print(f'OUTPUT: {o}')
      else:
          print(f'ERROR: {e}')
  