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but not working as intended logic

but not working as intended logic what i tried to do is in = total numbet of records here 7 then using for loop to loop 7 times---> i =1; NR==1 ##goto rrcord 1 --> store $4 in var and $3 in varb --> NR==varb ## goto record as specified in varb eg 2. them replcace $2 with var. loop over ---> i =2 goto record two and likewise

awk -v ty=$in '{for (i=1;i<=ty;i++) NR==$i; var=$4; varb=$3; NR == varb; $2=var; print}' 

in="$(awk 'END { print NR }' 1)" file awk -v ty=$in '{for (i=1;i<=ty;i++) NR==$i; var=$4; varb=$3; NR == varb; $2=var; print}' file