List the objects in a bucket using a prefix filter  |  Cloud Storage  |  Google Cloud (2022)

List the objects in a Cloud Storage bucket using a prefix.

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For detailed documentation that includes this code sample, see the following:

  • List objects

Code sample

C#

For more information, see the Cloud Storage C# API reference documentation.

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using Google.Cloud.Storage.V1;using System;using System.Collections.Generic;public class ListFilesWithPrefixSample{ /// <summary> /// Prefixes and delimiters can be used to emulate directory listings. /// Prefixes can be used to filter objects starting with prefix. /// The delimiter argument can be used to restrict the results to only the /// objects in the given "directory". Without the delimiter, the entire tree /// under the prefix is returned. /// For example, given these objects: /// a/1.txt /// a/b/2.txt /// /// If you just specify prefix="a/", you'll get back: /// a/1.txt /// a/b/2.txt /// /// However, if you specify prefix="a/" and delimiter="/", you'll get back: /// a/1.txt /// </summary> /// <param name="bucketName">The bucket to list the objects from.</param> /// <param name="prefix">The prefix to match. Only objects with names that start with this string will /// be returned. This parameter may be null or empty, in which case no filtering /// is performed.</param> /// <param name="delimiter">Used to list in "directory mode". Only objects whose names (aside from the prefix) /// do not contain the delimiter will be returned.</param> public IEnumerable<Google.Apis.Storage.v1.Data.Object> ListFilesWithPrefix( string bucketName = "your-unique-bucket-name", string prefix = "your-prefix", string delimiter = "your-delimiter") { var storage = StorageClient.Create(); var options = new ListObjectsOptions { Delimiter = delimiter }; var storageObjects = storage.ListObjects(bucketName, prefix, options); Console.WriteLine($"Objects in bucket {bucketName} with prefix {prefix}:"); foreach (var storageObject in storageObjects) { Console.WriteLine(storageObject.Name); } return storageObjects; }}

C++

For more information, see the Cloud Storage C++ API reference documentation.

(Video) Bucket options in Cloud Storage

namespace gcs = ::google::cloud::storage;[](gcs::Client client, std::string const& bucket_name, std::string const& bucket_prefix) { for (auto&& object_metadata : client.ListObjects(bucket_name, gcs::Prefix(bucket_prefix))) { if (!object_metadata) { throw std::runtime_error(object_metadata.status().message()); } std::cout << "bucket_name=" << object_metadata->bucket() << ", object_name=" << object_metadata->name() << "\n"; }}

Go

For more information, see the Cloud Storage Go API reference documentation.

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// Prefixes and delimiters can be used to emulate directory listings.// Prefixes can be used filter objects starting with prefix.// The delimiter argument can be used to restrict the results to only the// objects in the given "directory". Without the delimiter, the entire tree// under the prefix is returned.//// For example, given these blobs:// /a/1.txt// /a/b/2.txt//// If you just specify prefix="a/", you'll get back:// /a/1.txt// /a/b/2.txt//// However, if you specify prefix="a/" and delim="/", you'll get back:// /a/1.txtctx := context.Background()ctx, cancel := context.WithTimeout(ctx, time.Second*10)defer cancel()it := client.Bucket(bucket).Objects(ctx, &storage.Query{Prefix: prefix,Delimiter: delim,})for {attrs, err := it.Next()if err == iterator.Done {break}if err != nil {return err}fmt.Fprintln(w, attrs.Name)}
(Video) Get the list of cloud storage buckets from Google Cloud

Java

For more information, see the Cloud Storage Java API reference documentation.

import com.google.api.gax.paging.Page;import com.google.cloud.storage.Blob;import com.google.cloud.storage.Storage;import com.google.cloud.storage.StorageOptions;public class ListObjectsWithPrefix { public static void listObjectsWithPrefix( String projectId, String bucketName, String directoryPrefix) { // The ID of your GCP project // String projectId = "your-project-id"; // The ID of your GCS bucket // String bucketName = "your-unique-bucket-name"; // The directory prefix to search for // String directoryPrefix = "myDirectory/" Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService(); /** * Using the Storage.BlobListOption.currentDirectory() option here causes the results to display * in a "directory-like" mode, showing what objects are in the directory you've specified, as * well as what other directories exist in that directory. For example, given these blobs: * * <p>a/1.txt a/b/2.txt a/b/3.txt * * <p>If you specify prefix = "a/" and don't use Storage.BlobListOption.currentDirectory(), * you'll get back: * * <p>a/1.txt a/b/2.txt a/b/3.txt * * <p>However, if you specify prefix = "a/" and do use * Storage.BlobListOption.currentDirectory(), you'll get back: * * <p>a/1.txt a/b/ * * <p>Because a/1.txt is the only file in the a/ directory and a/b/ is a directory inside the * /a/ directory. */ Page<Blob> blobs = storage.list( bucketName, Storage.BlobListOption.prefix(directoryPrefix), Storage.BlobListOption.currentDirectory()); for (Blob blob : blobs.iterateAll()) { System.out.println(blob.getName()); } }}

Node.js

For more information, see the Cloud Storage Node.js API reference documentation.

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(Video) List files and folders of AWS S3 bucket using prefix & delimiter

/** * TODO(developer): Uncomment the following lines before running the sample. */// The ID of your GCS bucket// const bucketName = 'your-unique-bucket-name';// The directory prefix to search for// const prefix = 'myDirectory/';// The delimiter to use// const delimiter = '/';// Imports the Google Cloud client libraryconst {Storage} = require('@google-cloud/storage');// Creates a clientconst storage = new Storage();async function listFilesByPrefix() { /** * This can be used to list all blobs in a "folder", e.g. "public/". * * The delimiter argument can be used to restrict the results to only the * "files" in the given "folder". Without the delimiter, the entire tree under * the prefix is returned. For example, given these blobs: * * /a/1.txt * /a/b/2.txt * * If you just specify prefix = 'a/', you'll get back: * * /a/1.txt * /a/b/2.txt * * However, if you specify prefix='a/' and delimiter='/', you'll get back: * * /a/1.txt */ const options = { prefix: prefix, }; if (delimiter) { options.delimiter = delimiter; } // Lists files in the bucket, filtered by a prefix const [files] = await storage.bucket(bucketName).getFiles(options); console.log('Files:'); files.forEach(file => { console.log(file.name); });}listFilesByPrefix().catch(console.error);

PHP

For more information, see the Cloud Storage PHP API reference documentation.

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use Google\Cloud\Storage\StorageClient;/** * List Cloud Storage bucket objects with specified prefix. * * @param string $bucketName The name of your Cloud Storage bucket. * @param string $directoryPrefix the prefix to use in the list objects API call. */function list_objects_with_prefix($bucketName, $directoryPrefix){ // $bucketName = 'my-bucket'; // $directoryPrefix = 'myDirectory/'; $storage = new StorageClient(); $bucket = $storage->bucket($bucketName); $options = ['prefix' => $directoryPrefix]; foreach ($bucket->objects($options) as $object) { printf('Object: %s' . PHP_EOL, $object->name()); }}

Python

For more information, see the Cloud Storage Python API reference documentation.

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(Video) Access Control in Cloud Bucket using GCP #gcp #gcpcloud
from google.cloud import storagedef list_blobs_with_prefix(bucket_name, prefix, delimiter=None): """Lists all the blobs in the bucket that begin with the prefix. This can be used to list all blobs in a "folder", e.g. "public/". The delimiter argument can be used to restrict the results to only the "files" in the given "folder". Without the delimiter, the entire tree under the prefix is returned. For example, given these blobs: a/1.txt a/b/2.txt If you specify prefix ='a/', without a delimiter, you'll get back: a/1.txt a/b/2.txt However, if you specify prefix='a/' and delimiter='/', you'll get back only the file directly under 'a/': a/1.txt As part of the response, you'll also get back a blobs.prefixes entity that lists the "subfolders" under `a/`: a/b/ """ storage_client = storage.Client() # Note: Client.list_blobs requires at least package version 1.17.0. blobs = storage_client.list_blobs(bucket_name, prefix=prefix, delimiter=delimiter) print("Blobs:") for blob in blobs: print(blob.name) if delimiter: print("Prefixes:") for prefix in blobs.prefixes: print(prefix)

Ruby

For more information, see the Cloud Storage Ruby API reference documentation.

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def list_files_with_prefix bucket_name:, prefix:, delimiter: nil # Lists all the files in the bucket that begin with the prefix. # # This can be used to list all files in a "folder", e.g. "public/". # # The delimiter argument can be used to restrict the results to only the # "files" in the given "folder". Without the delimiter, the entire tree under # the prefix is returned. For example, given these files: # # a/1.txt # a/b/2.txt # # If you just specify `prefix: "a"`, you will get back: # # a/1.txt # a/b/2.txt # # However, if you specify `prefix: "a"` and `delimiter: "/"`, you will get back: # # a/1.txt # The ID of your GCS bucket # bucket_name = "your-unique-bucket-name" # The directory prefix to search for # prefix = "a" # The delimiter to be used to restrict the results # delimiter = "/" require "google/cloud/storage" storage = Google::Cloud::Storage.new bucket = storage.bucket bucket_name files = bucket.files prefix: prefix, delimiter: delimiter files.each do |file| puts file.name endend

What's next

To search and filter code samples for other Google Cloud products, see the Google Cloud sample browser.

FAQs

How do I list items in a GCP bucket? ›

List the objects in a bucket
  1. In the Google Cloud console, go to the Cloud Storage Buckets page. Go to Buckets.
  2. In the bucket list, click on the name of the bucket whose contents you want to view.
  3. Optionally, use filtering to narrow the results in your list.

What command is used to show a list of Cloud Storage buckets? ›

ls - List providers, buckets, or objects | Cloud Storage | Google Cloud.

What are the objects in Google Cloud Storage? ›

Objects are pieces of data that you have uploaded to Cloud Storage. For more information, see Object Name Requirements. Every object in Cloud Storage resides in a bucket. The object is owned by its original uploader, who will always retain OWNER permission on it.

Which of the following commands is used to create buckets in Cloud Storage? ›

mb - Make buckets | Cloud Storage | Google Cloud.

Where is my Google Cloud Storage bucket name? ›

In the Google Cloud console, go to the Cloud Storage Buckets page. In the bucket list, find the bucket you want to verify, and check its column headers for the metadata you want to view.

How do I access a Google Cloud Storage bucket from a service account? ›

In order to access Google Cloud Storage buckets, you must provide roles to the service account that allow access to specific buckets. To do so, you will need to navigate to the "Storage" section in the Google Cloud Console sidebar, and then select the "Browser" tab within that section.

What is bucket object storage? ›

In the Oracle Cloud Infrastructure Object Storage service, a bucket is a container for storing objects in a compartment within an Object Storage namespace. A bucket is associated with a single compartment.

Which of the following are storage services provided by GCP? ›

Google Cloud provides three main services for different types of storage: Persistent Disks for block storage, Filestore for network file storage, and Cloud Storage for object storage.

How do I use Google Cloud Storage? ›

You can use Google Cloud Storage to store data in Google's cloud.
...
Get started
  1. Select Browser in the lefthand menu.
  2. Click CREATE BUCKET.
  3. Enter a unique bucket name. ...
  4. Pick a storage class. ...
  5. Pick a location to store your data.

What is the use of bucket in GCP? ›

Stay organized with collections Save and categorize content based on your preferences. The Buckets resource represents a bucket in Cloud Storage. There is a single global namespace shared by all buckets.

How many types of Cloud Storage are there? ›

There are three types of cloud data storage: object storage, file storage, and block storage. Each offers their own advantages and have their own use cases: Object Storage - Applications developed in the cloud often take advantage of object storage's vast scalablity and metadata characteristics.

How do I check my Google Cloud Storage? ›

  1. In the Google Cloud console, go to the Cloud Storage Buckets page. Go to Buckets.
  2. Select your log bucket.
  3. Download or view your logs by clicking on the appropriate log object.

Which of the following database in GCP is designed to provide a scalable OLTP database? ›

Cloud Spanner is a fully managed, mission-critical relational database service. It is designed to provide a scalable online transaction processing (OLTP) database with high availability and strong consistency at global scale.

How do I create a bucket in Google Cloud command line? ›

-c : Specify the default storage class of your bucket. For example, NEARLINE . -l : Specify the location of your bucket. For example, US-EAST1 .
...
Create a new bucket
  1. In the Google Cloud console, go to the Cloud Storage Buckets page. ...
  2. Click Create bucket.
  3. On the Create a bucket page, enter your bucket information.

Which of the following command is used to create a database for an SQL instance on Google Cloud? ›

In the Google Cloud console, go to the Cloud SQL Instances page. Click Create instance. On the Choose your database engine panel of the Create an instance page, click Choose MySQL and click Next.

What is a bucket in cloud computing? ›

You store objects in containers called buckets. All buckets are associated with a project, and you can group your projects under an organization. Each project, bucket, and object in Google Cloud is a resource in Google Cloud, as are things such as Compute Engine instances.

What is the s3 bucket name? ›

In a virtual-hosted–style URL, the bucket name is part of the domain name in the URL. For example: http://bucket.s3.amazonaws.com. http://bucket.s3-aws-region.amazonaws.com.

Which of the following is a valid bucket name? ›

Bucket names can consist only of lowercase letters, numbers, dots (.), and hyphens (-). Bucket names must begin and end with a letter or number. Bucket names must not contain two adjacent periods. Bucket names must not be formatted as an IP address (for example, 192.168.

What process controls the access to resources on a cloud platform? ›

In most cases, IAM is the recommended method for controlling access to your resources. IAM controls permissioning throughout Google Cloud and allows you to grant permissions at the bucket and project levels.

How do I get a Google Access Key ID? ›

Create a service account key
  1. In the Google Cloud console, go to the Service accounts page. ...
  2. Select a project.
  3. On the Service accounts page, click the email address of the service account that you want to create a key for.
  4. Click the Keys tab.
  5. Click the Add key drop-down menu, then select Create new key.

How do I get my GCP access token? ›

Authorization and authentication
  1. Install the gcloud command line tool.
  2. Authenticate to your service account. In the following command, replace ${KEY_FILE} with the path to your service account key file: ...
  3. Use your service account to obtain an authorization token: gcloud auth print-access-token.

What is object storage example? ›

Object storage systems allow retention of massive amounts of unstructured data in which data is written once and read once (or many times). Object storage is used for purposes such as storing objects like videos and photos on Facebook, songs on Spotify, or files in online collaboration services, such as Dropbox.

How are objects stored in object storage? ›

Object storage takes each piece of data and designates it as an object. Data is kept in separate storehouses versus files in folders and is bundled with associated metadata and a unique identifier to form a storage pool.

What is cloud storage examples? ›

Some of the most popular cloud storage providers are Apple (iCloud), Amazon (Amazon Web Services ), Dropbox, and Google.

Which one of the following is a storage service provided by Google Cloud SQL cloud storage cloud firestore Google Cloud Store? ›

Google Cloud Storage is the object storage service offered by Google Cloud. It provides some interesting features such as object versioning or fine-grain permissions (per object or bucket), that can make development easy and help reduce operational overheads.

Which of the following Google Cloud services is a DevOps service? ›

Google Cloud Platform (GCP) DevOps Service.

Which of the following database services are provided by cloud SQL? ›

Build and deploy for the cloud faster because Cloud SQL offers standard MySQL, PostgreSQL, and SQL Server databases, ensuring application compatibility.

What are the four types of cloud storage? ›

Cloud storage can be separated into four categories:
  • Public cloud storage.
  • Private cloud storage.
  • Hybrid cloud storage.
  • Community cloud storage.
15 Jul 2022

How do I upload data to Google Cloud Storage? ›

In the Google Cloud console, go to the Cloud Storage Buckets page. In the list of buckets, click on the name of the bucket that you want to upload an object to. In the Objects tab for the bucket, either: Drag and drop the desired files from your desktop or file manager to the main pane in the Google Cloud console.

What are the libraries and tools for cloud storage on GCP? ›

  • Azure.
  • C#
  • C++
  • Data Science.
  • Digital Marketing.
  • Kotlin.
  • SalesForce.
  • TypeSript.
7 Oct 2019

What is blob in Google Cloud Storage? ›

An object in Google Cloud Storage. A Blob object includes the BlobId instance, the set of properties inherited from the BlobInfo class and the Storage instance. The class provides methods to perform operations on the object. Reading a property value does not issue any RPC calls.

What is Gcsfs? ›

gcsfs is a FUSE (Filesystem in Userspace) driver for Google Cloud Storage and other cloud storage providers that permits the mounting of buckets locally.

How do I know if a file is saved in Google Cloud? ›

To check if a file exists in Google Cloud Storage using Python, use the Blob.exists() method which returns a Boolean :
  1. from google. cloud import storage.
  2. client = storage. Client. ...
  3. bucket = storage. Bucket(client, 'example-bucket-skytowner')
  4. blob = bucket. blob('cat.png')
  5. blob. exists()
1 Jul 2022

What is the difference between gcloud and Gsutil? ›

"gcloud" can create and manage Google Cloud resources while "gsutil" cannot do so. "gsutil" can manipulate buckets, bucket's objects and bucket ACLs on GCS(Google Cloud Storage) while "gcloud" cannot do so.

How many types of Cloud Storage are there? ›

There are three types of cloud data storage: object storage, file storage, and block storage. Each offers their own advantages and have their own use cases: Object Storage - Applications developed in the cloud often take advantage of object storage's vast scalablity and metadata characteristics.

What is storage bucket in GCP? ›

You store objects in containers called buckets. All buckets are associated with a project, and you can group your projects under an organization. Each project, bucket, and object in Google Cloud is a resource in Google Cloud, as are things such as Compute Engine instances.

Which of the following are storage services provided by GCP? ›

Google Cloud provides three main services for different types of storage: Persistent Disks for block storage, Filestore for network file storage, and Cloud Storage for object storage.

What is Gsutil? ›

gsutil is a Python application that lets you access Cloud Storage from the command line. You can use gsutil to do a wide range of bucket and object management tasks, including: Creating and deleting buckets. Uploading, downloading, and deleting objects. Listing buckets and objects.

How do I get a Google Access Key ID? ›

Create a service account key
  1. In the Google Cloud console, go to the Service accounts page. ...
  2. Select a project.
  3. On the Service accounts page, click the email address of the service account that you want to create a key for.
  4. Click the Keys tab.
  5. Click the Add key drop-down menu, then select Create new key.

How do I delete a folder in cloud shell? ›

Description
  1. gsutil rm gs://bucket/kitten.png. Use the -r option to specify recursive object deletion. ...
  2. gsutil rm -r gs://bucket/subdir. ...
  3. gsutil rm -r gs://bucket. ...
  4. gsutil rm -a gs://bucket/** ...
  5. gsutil -m rm -r gs://my_bucket/subdir. ...
  6. some_program | gsutil -m rm -I. ...
  7. gsutil rm *.txt.

How do I change folder in Google Cloud Shell? ›

Open an existing repository with Cloud Shell
  1. Navigate into that directory. To automatically change directories to the one containing your repository, choose this option. ...
  2. Navigate into that directory and run git pull . ...
  3. Clone a new copy by using the git clone command.

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