Shell Programming and Scripting

trap
trap 'echo thanks for the math' EXIT
MATH=$((9))
echo '3*3='
while read -p 'answer: '  answer 1
do
  if [ "answer1" = "GETAL" ]
  then
    echo 'Right!'
    exit
  fi
  echo 'wrong!'
done

#!/bin/bash
i=1
while [ $i -le 10 ]; do
    j=1
    while [ $j -le 10 ]; do
        echo "$i * $j = $((i*j))"
        ((j+=1))
    done
    ((i+=1))
done

 
#!/bin/bash
i=1
while [ $i -le 10 ]; do
    j=1
    while [ $j -le 10 ]; do
      echo "$i * $j = "  
      read answer1
      if ["$answer1" -eq "$((i*j))"]
      then
        echo 'Right!'
        ((j+=1))
      else
        echo 'Wrong!' 
     fi     
    done
    ((i+=1))
done

~$   bash test1
1 * 1 = 
1
test1: line 8: [1: command not found
Wrong!

#!/bin/bash
trap 'echo Very well, keep practicing' EXIT

for (( i = 1; i <= 10; i++ ))
do
   for (( j = 1; j <= 10; j++ ))
   do
       answer=0
       while (( answer != i * j ))
       do
            read -p "$i * $j = " answer
[[ ${answer,,} == q ]] && exit

   
       done
   done
done