Question

it seems that I keep getting -gt or == error with the following. Can someone help?

flag= echo $flightSeatBooked | awk -F[,] '{print match($flightSeatBooked, $orderSeats)}'
if $flag == 0; then
        echo "Success";
else
        echo "fail";

Given:

flightSeatBooked= 9;,A1,A2,A3,A4,B2,E4,C3,B3,D3,D2,E1,E2,C2,B4,C4,D4,C1,D1,E3,B1
orderSeats= B2 (not found in the variable)

Expected output:
Success

Answer 1

Quite a few mistakes. Change it like this:

flag=$(echo $flightSeatBooked | awk -v flseat=$flightSeatBooked -v orseat=$orderSeats '{print match(flseat, orseat)}')

if [ $flag -eq 0 ]; then
        echo "Success";
else
        echo "fail";
fi

1. Command substitution has been done using the $(…) notation.
2. It is not a good practice to use the shell variables directly in awk, and hence passed shell variables to awk using -v.
3. The syntax of if used was incorrect, updated to correct it.