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 mkdir

 NAME
  mkdir  - Create a directory

 SYNOPSIS
  int error = mkdir(dirname)
  char *dirname;

 FUNCTION
  mkdir creates a new directory.  It returns 0 if successful, -1
  if not (with errno set to an error code).

 EXAMPLE
  main()
  {
      int r;

      r = mkdir("T:tmpdir");
      if (r == 0)
      puts("Created T:tmpdir successfully");
      else
      puts("Unable to create directory T:tmpdir");
  }

 INPUTS
  char *dirname;  filename of directory to create

 RESULTS
  int r;      0 if no error, < 0 if error