How to group by a column and calculate max/min on another

Select or download this

chrX    2680092    2744539    XG    1
chrX    2680090    2744529    XG    2
...
chrX    2680070    2744509    XG    4
chrX    2680070    2744509    DT    1
chrX    2680090    2744519    DT    2

Select or download this

chrX    2680070    2744539    XG    4
chrX    2680070    2744519    DT    2

Select or download this

#!/usr/bin/perl -w
use strict;
...
}

__DATA__

Select or download this

chrX    XG    1    2744539    2744539
chrX    DT    1    2744519    2744519

Select Code to Download