6 op1 6 op2 6 = ?

666.sh

#!/bin/bash
OPs="{++,--,**,*,/,%,+,-,\<\<,\>\>,\&,^,\|}"
eval "echo -ne ${OPs}' '${OPs}'\n'" |
while read op1 op2; do
        for eq in "6 $op1 6 $op2 6" "(6 $op1 6) $op2 6" "6 $op1 (6 $op2 6)"; do
                read a b c d e <<<"$eq"
                if [[ "$eq" == *\) ]] && [[ "$op1" == [/%] ]] && ((6 $op2 6 == 0)); then
                        printf -v ans "%19s∞" ""
                else
                        ans=$((eq))
                fi
                [[ "$c" == \(* ]] && c="$c "
                [[ "$c" == ? ]] && c=" $c "
                printf "%2s %2s %3s %2s %-2s = %20s\n" "$a" "$b" "$c" "$d" "$e" "$ans"
        done
done