Bash script to download all your Lambda functions.

ExportLambdaFunctions.sh

#!/usr/bin/env bash
#You need to have aws-cli installed and configured
#Credits to Reddit user u/aa93 for the suggestions

mkdir code
aws lambda list-functions | \
grep FunctionName | \
cut -d '"' -f4 | \
while read -r name; do
    aws lambda get-function --function-name $name | tail -n 3 | egrep -o 'https?://[^ ]+' | sed 's/"//' | xargs wget -O ./code/$name.zip
done

This worked for me using git-bash terminal on windows.

#!/usr/bin/env bash
#You need to have aws-cli installed and configured
#You need to have CURL installed
#Credits to Reddit user u/aa93 for the suggestions

mkdir -p code
aws lambda list-functions | \
grep FunctionName | \
#Select only matching prefix functions
grep <prefix> | \
cut -d '"' -f4 | \
while read -r name; do
    aws lambda get-function --function-name $name | tee ./code/$name.json | egrep -o 'https?://[^ ]+' | sed 's/"//' | xargs curl --output ./code/$name.zip
done