you miss "->"
use strict;
use warnings;
;;
my @ar = ([1,12],[8,3],[4,57],[22,5]);
my @sort = sort{$a->[1]<=>$b->[1]}@ar;
foreach (@sort){
print "@$_\n";}
PS D:\perl\perlmonks> perl .\sort.pl
8 3
22 5
1 12
4 57
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