Welcome

#!/bin/zsh

# Script to delete all Lambda Layers in an AWS account.

# Get a list of all Lambda Layer versions.  We use --query and --output text to get a clean list.
layer_versions=$(aws lambda list-layer-versions --query 'LayerVersions[*].LayerVersionArn' --output text --layer-name layer-name)

# Check if any layers exist.
if [[ -z "$layer_versions" ]]; then
  echo "No Lambda Layers found in this account."
  exit 0
fi

layer_versions_array=($(echo "$layer_versions" | tr '\n' ' '))

# Iterate through each layer version ARN.
for layer_version in "${layer_versions_array[@]}"; do
  # Extract the LayerName and Version from the ARN.  This is a bit tricky, but works reliably.
  # Example ARN: arn:aws:lambda:us-east-1:123456789012:layer:my-layer:1
  layer_name=$(echo "$layer_version" | cut -d: -f7) # Extract "my-layer"
  version=$(echo "$layer_version" | cut -d: -f8)  # Extract "1"

  # Delete the layer version.
  echo $layer_version
  echo "Deleting Layer: $layer_name, Version: $version"
  aws lambda delete-layer-version --layer-name "$layer_name" --version-number "$version"

  # Check for errors.  Important!
  if [[ $? -ne 0 ]]; then
    echo "Error deleting layer: $layer_name, Version: $version"
    #  You might want to add more sophisticated error handling here, like logging or retries.
    #  For now, the script continues, but you'll see the error message.
  fi
done

echo "Finished deleting Lambda Layers."

exit 0