// Generates a random.txt file with parameters specified, and exits
// parameters besides N, are only used internally to specify how big are the chunks written
<main> -g -N 100000 -b 10 -n 101 -o <filename>

// Sort the input file, using the temporary dir, and the parameters specified, save to the output file
<main> -i <input-file> -o <output-file> -d <tmp dir> -N 100000 -b 10 -n 101

// If no option is specified, system will prompt for parameters, and use the input data from stdin
<main>

• option -i implies the program is supposed to sort something, and thus is incompatible with -g
• when a parameter is not specified the default values are used:
  • i = "1.in"
  • o = "1.out"
  • d = "tmp"
  • g isn't set (false)
  • N = 100000
  • b = 10
  • n = 101