Something like that: 
sub GPA_sort {
    ( split /\t/, $students{ $a } )[ -1 ]
        <=>
    ( split /\t/, $students{ $b } )[ -1 ]
    }

[download]

In reply to Re: sorting by field of a tab-delimited hash value by jwkrahn
in thread sorting by field of a tab-delimited hash value by keiusui

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