What is the best way to write if else condition for 3 Boolean variable

Question

I have 3 boolean variables a,b and c. what's the best way to write the if else condition(or some better way) in bash to cover all combinations (refer pic).

for example: a=y,b=y and c=y then echo foo

I can write multiple elseif conditions but is there any alternate way?

Answer 1

Not really sure of what you're expecting precisely, but if you need to check every possible combination, and your variables can only have two values: y or n, then you can use a case statement:

case "$a$b$c" in
    yyy) echo bar ;;
    yyn) echo foo ;;
    yny) echo foo ;;
    ynn) echo foo ;;
    nyy) echo bar ;;
    nyn) echo foo ;;
    nny) echo foo ;;
    nnn) echo foo ;;
    *) echo error; exit 1 ;;
esac