Still the link is disfunctional
No. Like i already said, your end is what's dysfunctional. There's a whole web out there to google, so no excuse.
Also in my scripts aprt from the perl syntax i use greek characatets. does that mean that i have to save my scripts in utf8 encoding or ansi?
ANSI is not a specific encoding. It's Windows terminology to use the local encoding, for some definition of local.
But it's moot. Unless you use the broken/weird use encoding, Perl only understands iso-8859-1 (use utf8; off) and UTF-8 (use utf8; on).
iso-8859-1 doesn't support greek characters, so that leaves UTF-8.
why utf8 without Bom?
U+FEFF is only a BOM if it's the very first character of a file. (It's a zero-width no-break space elsewhere.)
#! is only a shebang if it's the very first characters of a file.
That means you can only use one or the other.