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C Execution: External View (cont)

Command-line arguments:
  • argc ... count of arguments, including command name
  • argv ... array of arguments, as text strings
File streams:
  • stdin ... standard input, by default: keyboard
  • stdout ... standard output, by default: screen
  • stderr ... standard error, by default: screen
Environment variables:
  • char *environ[] contains the env vars
  • the last element in environ[] contains NULL