Curl command to check if file exists in s3 bucket

 Hello Techie's,

 we can use below Shell script to check if particular file present in s3 bucket.

#--------------------------------------------------------------------

#s3 Bucket Credentials

#--------------------------------------------------------------------

s3_access_key=XXXXXXXXXXX

s3_secret_key=XXXXXXXXXXX

host=s3_bucket_api_url

bucket=s3_bucket_name

folder_name=name_of_the folder_in_bucket

file_name=name_of_the_file_to_check

#--------------------------------------------------------------------

#curl command variables

#--------------------------------------------------------------------

dateValue=`date -R`

contentType="application/xml"

filepath="/${bucket}/${folder_name}/${file_name}

signature_string="GET\n\${contentType}\n${dateValue}\n${filepath}"

signature_hash=`echo -en ${signature_string} | openssl sha1 -hmac ${s3_secret_key} -binary | base64`

#--------------------------------------------------------------------

#Curl command to check if file exists

#--------------------------------------------------------------------

FILE=$((($(curl -X GET \

-H "Host: ${host}" \

-H "Date: ${dateValue}" \

-H "Content-Type: ${contentType}" \

-H "Authorization: Aws ${s3_access_key}:${signature_hash}" \

--silent -I https://${host}/${bucket}/${folder_name}/${file_name} \

| grep -E "^HTTP" \

| awk -F " " '{print $2}') == 200)) \

&& echo "file exists")

#--------------------------------------------------------------------

#Check If File exists

#--------------------------------------------------------------------

if [ "${FILE}" = "file exists" ]; then

echo "file is already present in s3 bucket folder"

else

echo "file is not present in s3 bucket folder"

fi

#-------------------------------------------------------------------