Probably most people know about the "Eskimo greeting" "secret operator". I'm not sure if the following trick is common knowledge, but I just saw it for the first time in this blog post by Yary:
$ perl -MO=Deparse -M'5;print "foo"' -ne '}{print "bar"'
sub BEGIN {
require 5;
()
}
print 'foo';
LINE: while (defined($_ = readline ARGV)) {
();
}
{
print 'bar';
}
A neat little trick :-)
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