c:\@Work\Perl\monks>perl -le
"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\";}
"
Global symbol "@a" requires explicit package name at -e line 1.
Global symbol "@b" requires explicit package name at -e line 1.
Execution of -e aborted due to compilation errors.