This appears to work. We use the DATA filehandle so need no permission as Perl opens this for us. 

seek DATA,-6,1;   # back up into __DATA__ string
binmode DATA;
$end = <DATA>;
$end =~ s/.*__//; # delete everything except the line ending
for(split//,$end){printf "0x%x\n",ord $_}
__DATA__

# prints (on Win32)
0xd
0xa

[download]

Make sure there is a \n after the __DATA__

Does this port?

This also works as you would expect: 

my $tmp = 'c:/tmp.tmp';
open TMP, "+>$tmp" or die $!;
print TMP "\n";
seek TMP, 0, 0;
binmode TMP;
for(split//,<TMP>){printf "0x%x\n",ord $_}
close TMP;
unlink $tmp;
__END__

#prints (on Win32)
0xd
0xa

[download]

cheers

tachyon

s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print

In reply to Re: Quick and portable way to determine line-ending string? by tachyon
in thread Quick and portable way to determine line-ending string? by bikeNomad

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