Shell Programming and Scripting

#!/bin/sh

counter=0
until (($counter>5))
    counter2=1
    until (($counter2>6)); do
      if [ "$(eval echo \$testing$counter)" ]; then
        eval testing$counter="$(eval echo \$testing$counter) $counter2"
      else
        eval testing$counter="$counter2"
      fi
      let counter2=counter2+1
    done
    let counter=counter+1
done

testing1="1 2 3 4 5"
testing2="1 2 3 4 5"
testing3="1 2 3 4 5"
testing4="1 2 3 4 5"
testing5="1 2 3 4 5"

for counter in 1 2 3 4 5; do
  for counter2 in 1 2 3 4 5; do
      if [ $counter2 = 1 ]; then
        eval testing$counter=$counter2
      else
        eval testing$counter=\"\$testing$counter $counter2\"
      fi
  done
done

counter=0
example=1
until (($counter>2)); do
      if [ ! "$(eval echo "\$testing$example")" ]; then
            echo "FIRST LOOP, CREATING DYN VAR1"
            eval testing$example="test"
      else
            echo "SECOND LOOP, CREATING DYN VAR2"
            eval testing2$example="test"
            echo "SECOND LOOP COMPARING DYN VAR1 to DYN VAR2"
            if [ "$(eval echo \$testing$example)" == "$(eval echo \$testing2$example)" ]; then
                echo "SECOND LOOP MATCH!!!"
                echo "SECOND LOOP CHANGING SECOND DYN VAR TO GET NO MATCH NEXT LOOP"
                eval testing2$example="test2"
            else
                echo "THIRD LOOP NO MATCH!!!"
            fi
      fi
      let counter=counter+1
done

FIRST LOOP, CREATING DYN VAR1
SECOND LOOP, CREATING DYN VAR2
SECOND LOOP MATCH!!!
SECOND LOOP CHANGING SECOND DYN VAR TO GET NO MATCH NEXT LOOP
THIRD LOOP NO MATCH!!!

example=1
for counter in 0 1 2; do
      if [ ! "$(eval echo "\$testing$example")" ]; then
            echo "FIRST LOOP, CREATING DYN VAR1"
            eval testing$example="test"
      else
         if [ ! "$(eval echo "\$testing2$example")" ]; then
              echo "SECOND LOOP, CREATING DYN VAR2"
              eval testing2$example="test"
         fi
            echo "COMPARING DYN VAR1 to DYN VAR2"
            if [ "$(eval echo \$testing$example)" == "$(eval echo \$testing2$example)" ]; then
                echo "MATCH"
                echo "CHANGING SECOND DYN VAR TO GET NO MATCH NEXT LOOP"
                eval testing2$example="test2"
            else
                echo "NO MATCH"
            fi
      fi
done

notdefined() {
[ ${!1-X} != ${!1-Y} ]
}
dynval() {
  printf ${!1}
}
example=1
for counter in 0 1 2; do
      if notdefined testing$example ; then
            echo "FIRST LOOP, CREATING DYN VAR1"
            eval testing$example="test"
      else
            if notdefined testing2$example ; then
              echo "SECOND LOOP, CREATING DYN VAR2"
              eval testing2$example="test"
            fi
            echo "COMPARING DYN VAR1 to DYN VAR2"
            if [ "$(dynval testing$example)" == "$(dynval testing2$example)" ]; then
                echo "MATCH"
                echo "CHANGING SECOND DYN VAR TO GET NO MATCH NEXT LOOP"
                eval testing2$example="test2"
            else
                echo "NO MATCH"
            fi
      fi
done