Chances are there is a ^M at the end of the shebang line. Try converting the whole file to unix line ends.
Update: There are lots of ways. You can use system tr, ftp in ASC mode, zip/unzip for a bulk conversion, and any number of specialized unstandardized converters (not to mention awk and sed). Since you're learning perl, I suggest:
$ perl -pi.bak -e 's/\015//' *.pl
once you have checked
perlrun to see what the flags do.
After Compline,
Zaxo
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