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  1. or download this
    if( -t and !@ARGV) {
    die "Need a file or stream on standard input";
...
while (<>) {
    ...
};
  2. or download this
    >perl -w tmp.pl
Need a file or stream on standard input at tmp.pl line 2.
...
>perl -w tmp.pl tmp.pl

>perl -w tmp.pl <tmp.pl