Shell Programming and Scripting

A1 ={10 15 3 21}
A2 ={10 15 3 22}

A1 ={10 15 3 21}
A2 ={10 15 3 21 3} - this one would be greater.

A1 ={10 15 5 21} - this one greater
A2 ={10 15 3 21}

for i in "${A1[@]}"
do
    if [ ${#A1[@]} -eq ${#A2[@]} ]; then
        echo "TRUE"
    else 
        echo "FALSE"
    fi
done

for ((i=0; i<${#A1[@]} || i<${#A2[@]}; i++))
do
  if (( ${A1[i]:-0} > ${A2[i]:-0} )); then
    echo A1
    break
  elif (( ${A1[i]:-0} < ${A2[i]:-0} )); then
    echo A2
    break
  fi
done

echo "(" ${A1[@]} "), (" ${A2[@]} ")"
( 10 15 3 21 ), ( 10 15 3 20 )
LEN=${#A1[@]}; [ $LEN -lt ${#A2[@]} ] && LEN=${#A2[@]}
while [ 0$i -lt $LEN ]; do [ 0"${A1[$i]}" -gt 0"${A2[$i]}" ] && break; ((i++)); done; [ $i -eq $LEN ] && echo A2 || echo A1
A1