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Python

Howto

• Get script name

  appname = os.path.basename(__file__)

• Error messages

  def error_exit(msg):
      if msg == "": msg = "an error occurred"
      print("*** %s\nabort..." % msg)
      exit(1)
  
  def usage_exit():
      print("*** usage :")
      print("%s -opt1" % appname)
      print("%s -opt2 bla" % appname)
      print("abort...")
      exit(1)
  

• Read args

  import os, sys
  
  args = sys.argv
  size = len(args)
  if size < 2: exit(1)
  
  opt_val = ""
  i = 1
  while i < size:
      if args[i] == "-opt":
          i += 1
          if i >= size: exit(1)
          opt_val = args[i]
      else:
          exit(1)
      i += 1
  
  print(opt_val)
  

• Execute process

  import os, sys, subprocess
  
  def runcmd(cmd):
      ret = subprocess.run(cmd, shell=True, capture_output=True)
      result = ret.stdout.decode()
      return (result, ret.returncode)
  
  cmd = "ls -la"
  result, ret = runcmd(cmd)