Mengelompokkan nilai

awk '{if(81<=$2&&$2<=100) { print $1,$2,"A"}} {if(71<=$2&&$2<=80) { print $1,$2,"B"}} {if(61<=$2&&$2<=70) { print $1,$2,"C" }} {if(41<=$2&&$2<=60) { print $1,$2,"D"}} {if(0<=$2&&$2<=40) { print $1,$2,"E"}}' nilai.txt