How to update a file in github via cURL

updatefile.sh

#!/bin/bash

cartella="/var/myfolder"

# update the file
curl -i -X PUT -H 'Authorization: token 4d013330xxxxxxxxxxxxxx' -d "{\"path\": \"mattei.csv\", \
\"message\": \"update\", \"content\": \"$(openssl base64 -A -in $cartella/mattei.csv)\", \"branch\": \"master\",\
\"sha\": $(curl -X GET https://api.github.com/repos/username/repo/contents/mattei.csv | jq .sha)}" \
https://api.github.com/repos/username/repo/contents/mattei.csv