1 import sys

     2 

     3 formatted_args = []

     4 

     5 UNSAFE_CHARACTERS = [" ", "!", "\"", "#", "$", "&", "'", "(", ")", "*", ",", ";", "<", ">", "?", "[", "\\", "]", "^", "`", "{", "|", "}", ":", "~", "/"]

     6 

     7 

     8 def find_unsafe(arg):

     9     for unsafe in UNSAFE_CHARACTERS:

    10         if unsafe in arg:

    11             return True

    12 

    13     return False

    14 

    15 

    16 for arg in sys.argv[1:]:

    17     if find_unsafe(arg):

    18         formatted_args.append('"%s"' % arg)

    19     else:

    20         formatted_args.append(arg)

    21 

    22 print("$ " + " ".join(formatted_args))