Backup file to s3

backup_s3.sh

#!/bin/bash

file="file-to-backup.gz"
contentType="application/x-gzip"

bucket="bucketname"
region="ap-southeast-1"
resource="/${bucket}/${file}"
dateValue=`date -R`
stringToSign="PUT\n\n${contentType}\n${dateValue}\n${resource}"
s3Key="XXXXXXXXXXXXXXXXX"
s3Secret="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
signature=`echo -en ${stringToSign} | openssl sha1 -hmac ${s3Secret} -binary | base64`
echo "$stringToSign | $signature"

curl -i -X PUT -T "${file}" \
  -H "Host: ${bucket}.s3.amazonaws.com" \
  -H "Date: ${dateValue}" \
  -H "Content-Type: ${contentType}" \
  -H "Authorization: AWS ${s3Key}:${signature}" \
  https://${bucket}.s3-${region}.amazonaws.com/${file}

rm -rf $file

cd $pwd
echo "Backup done\n"