Shell Programming and Scripting

nawk -v r=2 -v c=3 -v val=5 -F, 'BEGIN{OFS=","}; NR != r; NR == r {$c = val; print}' mydata

nawk -v r=2 -v c=3 -v p=2 -v val=5 -F, 'BEGIN{OFS=","}; NR != r; NR == r {if($r == p){$r = val}; print}' mydata

awk -v r=15 19 -v c=7 -v val=96 -F,

open $fh,"<","a.txt";
my ($row,$col,$val)=(4,1,'haha');
while(<$fh>){
	if($.==$row){
		my @arr=split;
		$arr[$col-1]=$val;
		print join " ",@arr;
		print "\n";
	}
	else{
		print;
	}
}