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score=0of=0clear;while [ 1 = 1 ]; do  ans=  num1=$((RANDOM%13+0))  num2=$((RANDOM%13+0))  sign=$((RANDOM%4+0))  printf "/exit to quit\n"  read -p $num1'x'$num2= -t 5  ans  let answer=$num1*$num2  cor=$(expr $ans = $answer)  if [ "$cor" = "1" ];    then printf "\nCorrect.\n" && score=$(expr $score + 1) && of=$(expr $of + 1 )     else printf "\nWrong, the correct answer is "$answer"\n" && of=$(expr $of + 1);#    elif [ $cor = '/exit' ];#      then clear #      echo "You got $score right."#      read -p 'Hit enter to exit'#      exit 0;#      fi;    fi;  printf 'So far you have answered '$score' out of '$of' right.'  seconds=$(date '+%S')  if [ $seconds -gt "57" ];    then let new=$seconds-56;    else let new=$seconds+4;    fi;  while [ $seconds -lt $new ];do    seconds=""    seconds=$(date '+%S')    done;  clear;  done;