deletes old versions of lambdas that aren't aliased

deleteLambdas.sh

#!/bin/bash
for (( i=1; i<=$2; i++ ))
do
  aws lambda delete-function --function-name $1 --qualifier $i &>/dev/null
  echo "lambda $1 version $i was deleted"
done

For those who end up downloading this file, please remember to add executing permissions to the file.
In the Terminal go to the folder where this file is located and type in the following command.
chmod +x deleteLambdas.sh

PS - Thank you for this, @jankei!

What if I need to keep only 10 version from lambda functions and rest one is deleted

`#!/bin/bash
fnlist=(
'SAMPLE FUNCTION'

Add more functions here

)

count=0
while [ "x${fnlist[count]}" != "x" ]
do
for (( i=1; i<=$1; i++ ))
do
aws lambda delete-function --function-name ${fnlist[count]} --qualifier $i
echo "lambda ${fnlist[count]} version $i was deleted"
done
count=$(( $count + 1 ))
done
`

sorry about the formatting. i did a bit more to allow for the deletion of multiple functions as a loop