AWS CLI alias for fetching the etag of an S3 object.

.aws/cli/alias

@@ -12,3 +12,4 @@ metadata-region = !python3 << EOF
 du = s3 ls --recursive --human-readable --summarize
 enable_ena = ec2 modify-instance-attribute --ena-support --instance-id
 assume-role = !assume-role
+s3-etag = !f() { aws s3api head-object --bucket "$1" --key "$2" --query 'ETag' --output text | xargs; }; f