Sean Wei says to OwO
#!/bin/bash id=$1 if [[ $id =~ ^F[0-9]{9}$ ]]; then check=6 check1=$((`echo $id |head -c2 |tail -c1`*8)) check2=$((`echo $id |head -c3 |tail -c1`*7)) check3=$((`echo $id |head -c4 |tail -c1`*6)) check4=$((`echo $id |head -c5 |tail -c1`*5)) check5=$((`echo $id |head -c6 |tail -c1`*4)) check6=$((`echo $id |head -c7 |tail -c1`*3)) check7=$((`echo $id |head -c8 |tail -c1`*2)) check8=$((`echo $id |head -c9 |tail -c1`*1)) check9=$((`echo $id |head -c10 |tail -c1`*1)) check=$(($check + $check1 + $check2 + $check3 + $check4 + $check5 + $check6 + $check7 + $check8 + $check9)) check=$(($check % 10)) if [[ $check != 0 ]]; then exit fi fi curl "https://esa.ntpc.edu.tw/fucking" \ -d "idno=$id" \ 2> /dev/null \ |jq .