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perl -MFcntl=:flock -e 'print 2+LOCK_EX'
perl -wle 'print $^W*2**$^W*2'
#!/usr/bin/perl -w ... print "Pick another integer between 1 and 3\n"; $num += <STDIN>; print "The sum is " . $num;
perl -wle '%h = map {(qq{sum}) => $h{'sum'}+=$_ } qw/2 2/; print $h{s +um}'
#!/usr/bin/perl -w ... my %foo; %foo = map {('sum') => $foo{'sum'}+=$_ } qw/2 2/; print $foo{sum};
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