Programming language: Go
License: MIT License
Latest version: v2.0.0

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s5cmd is a very fast S3 and local filesystem execution tool. It comes with support for a multitude of operations including tab completion and wildcard support for files, which can be very handy for your object storage workflow while working with large number of files.

There are already other utilities to work with S3 and similar object storage services, thus it is natural to wonder what s5cmd has to offer that others don't.

In short, s5cmd offers a very fast speed. Thanks to Joshua Robinson for his study and experimentation on s5cmd; to quote his medium post:

For uploads, s5cmd is 32x faster than s3cmd and 12x faster than aws-cli. For downloads, s5cmd can saturate a 40Gbps link (~4.3Β GB/s), whereas s3cmd and aws-cli can only reach 85 MB/s and 375 MB/s respectively.

If you would like to know more about performance of s5cmd and the reasons for its fast speed, refer to [benchmarks](./README.md#Benchmarks) section



s5cmd supports wide range of object management tasks both for cloud storage services and local filesystems.

  • List buckets and objects
  • Upload, download or delete objects
  • Move, copy or rename objects
  • Set Server Side Encryption using AWS Key Management Service (KMS)
  • Set Access Control List (ACL) for objects/files on the upload, copy, move.
  • Print object contents to stdout
  • Select JSON records from objects using SQL expressions
  • Create or remove buckets
  • Summarize objects sizes, grouping by storage class
  • Wildcard support for all operations
  • Multiple arguments support for delete operation
  • Command file support to run commands in batches at very high execution speeds
  • Dry run support
  • S3 Transfer Acceleration support
  • Google Cloud Storage (and any other S3 API compatible service) support
  • Structured logging for querying command outputs
  • Shell auto-completion
  • S3 ListObjects API backward compatibility


Official Releases


The Releases page provides pre-built binaries for Linux, macOS and Windows.


For macOS, a homebrew tap is provided:

brew install peak/tap/s5cmd

Unofficial Releases (by Community)

Packaging status

Warning These releases are maintained by the community. They might be out of date compared to the official releases.


You can also install s5cmd from MacPorts on macOS:

sudo port selfupdate
sudo port install s5cmd

s5cmd is included in the conda-forge channel, and it can be downloaded through the Conda.

Installing s5cmd from the conda-forge channel can be achieved by adding conda-forge to your channels with:

conda config --add channels conda-forge
conda config --set channel_priority strict

Once the conda-forge channel has been enabled, s5cmd can be installed with conda:

conda install s5cmd

ps. Quoted from s5cmd feedstock. You can also find further instructions on its README.

Build from source

You can build s5cmd from source if you have Go 1.17+ installed.

go get github.com/peak/s5cmd

⚠️ Please note that building from master is not guaranteed to be stable since development happens on master branch.


$ docker pull peakcom/s5cmd
$ docker run --rm -v ~/.aws:/root/.aws peakcom/s5cmd <S3 operation>

ℹ️ /aws directory is the working directory of the image. Mounting your current working directory to it allows you to run s5cmd as if it was installed in your system;

docker run --rm -v $(pwd):/aws -v ~/.aws:/root/.aws peakcom/s5cmd <S3 operation>
$ git clone https://github.com/peak/s5cmd && cd s5cmd
$ docker build -t s5cmd .
$ docker run --rm -v ~/.aws:/root/.aws s5cmd <S3 operation>


s5cmd supports multiple-level wildcards for all S3 operations. This is achieved by listing all S3 objects with the prefix up to the first wildcard, then filtering the results in-memory. For example, for the following command;

s5cmd cp 's3://bucket/logs/2020/03/*' .

first a ListObjects request is send, then the copy operation will be executed against each matching object, in parallel.


Download a single S3 object
s5cmd cp s3://bucket/object.gz .
Download multiple S3 objects

Suppose we have the following objects:

s5cmd cp 's3://bucket/logs/2020/03/*' logs/

s5cmd will match the given wildcards and arguments by doing an efficient search against the given prefixes. All matching objects will be downloaded in parallel. s5cmd will create the destination directory if it is missing.

logs/ directory content will look like:

$ tree
└── logs
    β”œβ”€β”€ 18
    β”‚Β Β  └── file1.gz
    └── 19
        β”œβ”€β”€ file2.gz
        └── originals
            └── file3.gz

4 directories, 3 files

ℹ️ s5cmd preserves the source directory structure by default. If you want to flatten the source directory structure, use the --flatten flag.

s5cmd cp --flatten 's3://bucket/logs/2020/03/*' logs/

logs/ directory content will look like:

$ tree
└── logs
    β”œβ”€β”€ file1.gz
    β”œβ”€β”€ file2.gz
    └── file3.gz

1 directory, 3 files
Upload a file to S3
s5cmd cp object.gz s3://bucket/

by setting server side encryption (aws kms) of the file:

s5cmd cp -sse aws:kms -sse-kms-key-id <your-kms-key-id> object.gz s3://bucket/

by setting Access Control List (acl) policy of the object:

s5cmd cp -acl bucket-owner-full-control object.gz s3://bucket/
Upload multiple files to S3
s5cmd cp directory/ s3://bucket/

Will upload all files at given directory to S3 while keeping the folder hierarchy of the source.

Delete an S3 object
s5cmd rm s3://bucket/logs/2020/03/18/file1.gz
Delete multiple S3 objects
s5cmd rm s3://bucket/logs/2020/03/19/*

Will remove all matching objects:


s5cmd utilizes S3 delete batch API. If matching objects are up to 1000, they'll be deleted in a single request. However, it should be noted that commands such as

s5cmd rm s3://bucket-foo/object s3://bucket-bar/object

are not supported by s5cmd and result in error (since we have 2 different buckets), as it is in odds with the benefit of performing batch delete requests. Thus, if in need, one can use s5cmd run mode for this case, i.e,

$ s5cmd run
rm s3://bucket-foo/object
rm s3://bucket-bar/object

more details and examples on s5cmd run are presented in a [later section](./README.md#L224).

Copy objects from S3 to S3

s5cmd supports copying objects on the server side as well.

s5cmd cp 's3://bucket/logs/2020/*' s3://bucket/logs/backup/

Will copy all the matching objects to the given S3 prefix, respecting the source folder hierarchy.

⚠️ Copying objects (from S3 to S3) larger than 5GB is not supported yet. We have an open ticket to track the issue.

Select JSON object content using SQL

s5cmd supports the SelectObjectContent S3 operation, and will run your SQL query against objects matching normal wildcard syntax and emit matching JSON records via stdout. Records from multiple objects will be interleaved, and order of the records is not guaranteed (though it's likely that the records from a single object will arrive in-order, even if interleaved with other records).

$ s5cmd select --compression GZIP \
  --query "SELECT s.timestamp, s.hostname FROM S3Object s WHERE s.ip_address LIKE '10.%' OR s.application='unprivileged'" \

At the moment this operation only supports JSON records selected with SQL. S3 calls this lines-type JSON, but it seems that it works even if the records aren't line-delineated. YMMV.

Count objects and determine total size
$ s5cmd du --humanize 's3://bucket/2020/*'

30.8M bytes in 3 objects: s3://bucket/2020/*
Run multiple commands in parallel

The most powerful feature of s5cmd is the commands file. Thousands of S3 and filesystem commands are declared in a file (or simply piped in from another process) and they are executed using multiple parallel workers. Since only one program is launched, thousands of unnecessary fork-exec calls are avoided. This way S3 execution times can reach a few thousand operations per second.

s5cmd run commands.txt


cat commands.txt | s5cmd run

commands.txt content could look like:

cp s3://bucket/2020/03/* logs/2020/03/

# line comments are supported
rm s3://bucket/2020/03/19/file2.gz

# empty lines are OK too like above

# rename an S3 object
mv s3://bucket/2020/03/18/file1.gz s3://bucket/2020/03/18/original/file.gz

sync command synchronizes S3 buckets, prefixes, directories and files between S3 buckets and prefixes as well. It compares files between source and destination, taking source files as source-of-truth;

  • copies files those do not exist in destination
  • copies files those exist in both locations if the comparison made with sync strategy allows it so

It makes a one way synchronization from source to destination without modifying any of the source files and deleting any of the destination files (unless --delete flag has passed).

Suppose we have following files;

   -  29 Sep 10:00 .
5000  29 Sep 11:00 β”œβ”€β”€ favicon.ico
 300  29 Sep 10:00 β”œβ”€β”€ index.html
  50  29 Sep 10:00 β”œβ”€β”€ readme.md
  80  29 Sep 11:30 └── styles.css
s5cmd ls s3://bucket/static/
2021/09/29 10:00:01               300 index.html
2021/09/29 11:10:01                10 readme.md
2021/09/29 10:00:01                90 styles.css
2021/09/29 11:10:01                10 test.html

running would;

  • copy favicon.ico
    • file does not exist in destination.
  • copy styles.css
    • source file is newer than to remote counterpart.
  • copy readme.md
    • even though the source one is older, it's size differs from the destination one; assuming source file is the source of truth. ``` s5cmd sync . s3://bucket/static/

cp favicon.ico s3://bucket/static/favicon.ico cp styles.css s3://bucket/static/styles.css cp readme.md s3://bucket/static/readme.md

Running with `--delete` flag would delete files those do not exist in the source;

s5cmd sync --delete . s3://bucket/static/

rm s3://bucket/test.html cp favicon.ico s3://bucket/static/favicon.ico cp styles.css s3://bucket/static/styles.css cp readme.md s3://bucket/static/readme.md

It's also possible to use wildcards to sync only a subset of files.

To sync only `.html` files in S3 bucket above to same local file system;

s5cmd sync 's3://bucket/static/*.html' .

cp s3://bucket/prefix/index.html index.html cp s3://bucket/prefix/test.html test.html

##### Strategy
###### Default
By default `s5cmd` compares files' both size **and** modification times, treating source files as **source of truth**. Any difference in size or modification time would cause `s5cmd` to copy source object to destination.

mod time    |  size        |  should sync
src > dst   |  src != dst  |  βœ…
src > dst   |  src == dst  |  βœ…
src <= dst  |  src != dst  |  βœ…
src <= dst  |  src == dst  |  ❌

###### Size only
With `--size-only` flag, it's possible to use the strategy that would only compare file sizes. Source treated as **source of truth** and any difference in sizes would cause `s5cmd` to copy source object to destination.

mod time   |  size        |  should sync
src > dst  |  src != dst  |  βœ…
src > dst  |  src = dst   |  ❌
src <= dst  |  src != dst  |  βœ…
src <= dst  |  src == dst  |  ❌

### Dry run
`--dry-run` flag will output what operations will be performed without actually
carrying out those operations.



    s5cmd --dry-run cp s3://bucket/pre/* s3://another-bucket/

will output

    cp s3://bucket/pre/file1.gz s3://another-bucket/file1.gz
    cp s3://bucket/pre/last.txt s3://anohter-bucket/last.txt

however, those copy operations will not be performed. It is displaying what
`s5cmd` will do when ran without `--dry-run`

Note that `--dry-run` can be used with any operation that has a side effect, i.e.,
cp, mv, rm, mb ...

### S3 ListObjects API Backward Compatibility

The `--use-list-objects-v1` flag will force using S3 ListObjectsV1 API. This
flag is useful for services that do not support ListObjectsV2 API.

s5cmd --use-list-objects-v1 ls s3://bucket/

### Specifying credentials

`s5cmd` uses official AWS SDK to access S3. SDK requires credentials to sign
requests to AWS. Credentials can be provided in a variety of ways:
- Command line options `--profile` to use a [named profile](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-profiles.html), `--credentials-file` flag to use the specified credentials file, and `--no-sign-request` to send requests anonymously
- Environment variables
- AWS credentials file, including profile selection via `AWS_PROFILE` environment
- If `s5cmd` runs on an Amazon EC2 instance, EC2 IAM role
- If `s5cmd` runs on EKS, Kube IAM role

The SDK detects and uses the built-in providers automatically, without requiring
manual configurations.

### Region detection

While executing the commands, `s5cmd` detects the region according to the following order of priority:

1. `--source-region` or `--destination-region` flags of `cp` command.
2. `AWS_REGION` environment variable.
3. Region section of AWS profile.
4. Auto detection from bucket region (via `HeadBucket`).
5. `us-east-1` as default region.

### Shell auto-completion

Shell completion is supported for bash, pwsh (PowerShell) and zsh.

Run `s5cmd --install-completion` to obtain the appropriate auto-completion script for your shell, note that `install-completion` does not install the auto-completion but merely gives the instructions to install. The name is kept as it is for backward compatibility.

To actually enable auto-completion:
####  in bash and zsh:
 you should add auto-completion script to `.bashrc` and `.zshrc` file.
#### in pwsh:
you should save the autocompletion script to a file named `s5cmd.ps1` and add the full path of "s5cmd.ps1" file to profile file (which you can locate with `$profile`)

Finally, restart your shell to activate the changes.

> **Note**
The environment variable `SHELL` must be accurate for the autocompletion to function properly. That is it should point to `bash` binary in bash, to `zsh` binary in zsh and to `pwsh` binary in PowerShell.

> **Note**
The autocompletion is tested with following versions of the shells: \
***zsh*** 5.8.1 (x86_64-apple-darwin21.0) \
GNU ***bash***, version 5.1.16(1)-release (x86_64-apple-darwin21.1.0) \
***PowerShell*** 7.2.6 

### Google Cloud Storage support

`s5cmd` supports S3 API compatible services, such as GCS, Minio or your favorite
object storage.

    s5cmd --endpoint-url https://storage.googleapis.com ls

or an alternative with environment variable

    S3_ENDPOINT_URL="https://storage.googleapis.com" s5cmd ls

    # or

    export S3_ENDPOINT_URL="https://storage.googleapis.com"
    s5cmd ls

all variants will return your GCS buckets.

`s5cmd` reads `.aws/credentials` to access Google Cloud Storage. Populate the `aws_access_key_id` and `aws_secret_access_key` fields in `.aws/credentials` with an HMAC key created using this [procedure](https://cloud.google.com/storage/docs/authentication/managing-hmackeys#create).

`s5cmd` will use virtual-host style bucket resolving for S3, S3 transfer
acceleration and GCS. If a custom endpoint is provided, it'll fallback to

### Retry logic

`s5cmd` uses an exponential backoff retry mechanism for transient or potential
server-side throttling errors. Non-retriable errors, such as `invalid
credentials`, `authorization errors` etc, will not be retried. By default,
`s5cmd` will retry 10 times for up to a minute. Number of retries are adjustable
via `--retry-count` flag.

ℹ️ Enable debug level logging for displaying retryable errors.

## Using wildcards

On some shells, like zsh, the `*` character gets treated as a file globbing
wildcard, which causes unexpected results for `s5cmd`. You might see an output

zsh: no matches found

If that happens, you need to wrap your wildcard expression in single quotes, like:

s5cmd cp '*.gz' s3://bucket/

## Output

`s5cmd` supports both structured and unstructured outputs.
* unstructured output

$ s5cmd cp s3://bucket/testfile .

cp s3://bucket/testfile testfile
$ s5cmd cp --no-clobber s3://somebucket/file.txt file.txt

ERROR "cp s3://somebucket/file.txt file.txt": object already exists
  • If --json flag is provided:
    "operation": "cp",
    "success": true,
    "source": "s3://bucket/testfile",
    "destination": "testfile",
    "object": "[object]"
    "operation": "cp",
    "job": "cp s3://somebucket/file.txt file.txt",
    "error": "'cp s3://somebucket/file.txt file.txt': object already exists"

Configuring Concurrency


numworkers is a global option that sets the size of the global worker pool. Default value of numworkers is 256. Commands such as cp, select and run, which can benefit from parallelism use this worker pool to execute tasks. A task can be an upload, a download or anything in a run file.

For example, if you are uploading 100 files to an S3 bucket and the --numworkers is set to 10, then s5cmd will limit the number of files concurrently uploaded to 10.

s5cmd --numworkers 10 cp '/Users/foo/bar/*' s3://mybucket/foo/bar/


concurrency is a cp command option. It sets the number of parts that will be uploaded or downloaded in parallel for a single file. This parameter is used by the AWS Go SDK. Default value of concurrency is 5.

numworkers and concurrency options can be used together:

s5cmd --numworkers 10 cp --concurrency 10 '/Users/foo/bar/*' s3://mybucket/foo/bar/

If you have a few, large files to download, setting --numworkers to a very high value will not affect download speed. In this scenario setting --concurrency to a higher value may have a better impact on the download speed.


Some benchmarks regarding the performance of s5cmd are introduced below. For more details refer to this post which is the source of the benchmarks to be presented.

Upload/download of single large file

Uploading large number of small-sized files

Performance comparison on different hardware

So, where does all this speed come from?

There are mainly two reasons for this:

  • It is written in Go, a statically compiled language designed to make development of concurrent systems easy and make full utilization of multi-core processors.
  • Parallelization. s5cmd starts out with concurrent worker pools and parallelizes workloads as much as possible while trying to achieve maximum throughput.

performance regression tests

[bench.py](benchmark/bench.py) script can be used to compare performance of two different s5cmd builds. Refer to this [readme](benchmark/README.md) file for further details.

Advanced Usage

Some of the advanced usage patterns provided below are inspired by the following article (thank you! @joshuarobinson)

Integrate s5cmd operations with Unix commands

Assume we have a set of objects on S3, and we would like to list them in sorted fashion according to object names.

$ s5cmd ls s3://bucket/reports/ | sort -k 4
2020/08/17 09:34:33              1364 antalya.csv
2020/08/17 09:34:33                 0 batman.csv
2020/08/17 09:34:33             23114 istanbul.csv
2020/08/17 09:34:33             26154 izmir.csv
2020/08/17 09:34:33               112 samsun.csv
2020/08/17 09:34:33             12552 van.csv

For a more practical scenario, let's say we have an avocado prices dataset, and we would like to take a peek at the few lines of the data by fetching only the necessary bytes.

$ s5cmd cat s3://bucket/avocado.csv.gz | gunzip | xsv slice --len 5 | xsv table
    Date        AveragePrice  Total Volume  4046     4225       4770   Total Bags  Small Bags  Large Bags  XLarge Bags  type          year  region
0   2015-12-27  1.33          64236.62      1036.74  54454.85   48.16  8696.87     8603.62     93.25       0.0          conventional  2015  Albany
1   2015-12-20  1.35          54876.98      674.28   44638.81   58.33  9505.56     9408.07     97.49       0.0          conventional  2015  Albany
2   2015-12-13  0.93          118220.22     794.7    109149.67  130.5  8145.35     8042.21     103.14      0.0          conventional  2015  Albany
3   2015-12-06  1.08          78992.15      1132.0   71976.41   72.58  5811.16     5677.4      133.76      0.0          conventional  2015  Albany
4   2015-11-29  1.28          51039.6       941.48   43838.39   75.78  6183.95     5986.26     197.69      0.0          conventional  2015  Albany

Beast Mode s5cmd

s5cmd allows to pass in some file, containing list of operations to be performed, as an argument to the run command as illustrated in the [above](./README.md#L224) example. Alternatively, one can pipe in commands into the run:

BUCKET=s5cmd-test; s5cmd ls s3://$BUCKET/*test | grep -v DIR | awk β€˜{print $NF}’
| xargs -I {} echo β€œcp s3://$BUCKET/{} /local/directory/” | s5cmd run

The above command performs two s5cmd invocations; first, searches for files with test suffix and then creates a copy to local directory command for each matching file and finally, pipes in those into the run.

Let's examine another usage instance, where we migrate files older than 30 days to a cloud object storage:

find /mnt/joshua/nachos/ -type f -mtime +30 | awk '{print "mv "$1" s3://joshuarobinson/backup/"$1}'
| s5cmd run

It is worth to mention that, run command should not be considered as a silver bullet for all operations. For example, assume we want to remove the following objects:


Rather than executing

rm s3://bucket/prefix/2020/03/object1.gz
rm s3://bucket/prefix/2020/04/object1.gz
rm s3://bucket/prefix/2020/09/object77.gz

with run command, it is better to just use

rm s3://bucket/prefix/2020/0*/object*.gz

the latter sends single delete request per thousand objects, whereas using the former approach sends a separate delete request for each subcommand provided to run. Thus, there can be a significant runtime difference between those two approaches.



*Note that all licence references and agreements mentioned in the s5cmd README section above are relevant to that project's source code only.