Bash script to get private s3 file from http://stackoverflow.com/questions/27658147/download-private-file-from-s3-using-bash

gistfile1.txt

bucket=your-bucket-name
contentType="text/plain" 
dateValue="`date +'%a, %d %b %Y %H:%M:%S %z'`" 
stringToSign="GET\n\n${contentType}\n${dateValue}\n${resource}"
s3Key=xxxxxx 
s3Secret=xxxxx
signature=`/bin/echo -en "$stringToSign" | openssl sha1 -hmac ${s3Secret} -binary | base64` 

file1=file-name
resource1="/${bucket}/${file1}" 
curl -H "Date: ${dateValue}" -H "Content-Type: ${contentType}" -H "Authorization: AWS ${s3Key}:${signature}" "https://s3-us-west-2.amazonaws.com/${resource1}" -o "file-name-to-save-the-output"