# about the file
file_to_upload=<file you want to upload>
bucket=<your s3 bucket name>
filepath="/${bucket}/${file_to_upload}"
# metadata
contentType="application/x-compressed-tar"
dateValue=`date -R`
signature_string="PUT\n\n${contentType}\n${dateValue}\n${filepath}"
#s3 keys
s3_access_key=<your s3 access key>
s3_secret_key=<your s3 secret key>
#prepare signature hash to be sent in Authorization header
signature_hash=`echo -en ${signature_string} | openssl sha1 -hmac ${s3_secret_key} -binary | base64`
# actual curl command to do PUT operation on s3