Producing Homepages

We can use the die function to print an error message and end the program. For example,

  if( !open( DATA_FILE, "< $DATA_FILENAME" ) )
  {
    die "Cannot open data file $DATA_FILENAME: $!";
  }

Note 1: The $! variable is a special Perl variable for trapping error messages from the system right after a failed system request.