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produces a copy of its own source code

In computing, a quine is a computer program which produces a copy of its own source code as its only output.
perl
seek DATA,0,0;
print <DATA>;
__DATA__
Cheating quine.
$_=q(print qq(\$_=q($_);eval\n));eval
$x=q($x=q(%s);printf($x,$x););printf($x,$x);