s3_edit.sh

#!/usr/bin/env bash

set -e

bucket_path=$1
bucket_bk_path="$1_$(date +%s)"
tmp_file=$(mktemp)

# Donwload a temporary file
aws s3 cp "${bucket_path}" "${tmp_file}"
trap "{ rm -f \"$tmp_file\"; }" EXIT

# Edit
vim "${tmp_file}"

# Backup file before replace
aws s3 cp "${bucket_path}" "${bucket_bk_path}"

# Replace file
aws s3 cp "${tmp_file}" "${bucket_path}"