s3cmd

A free command line tool and client for uploading, retrieving and managing data in Amazon S3.

Runs as s3cmd|macOS, Linux, Windows|s3tools.org

Command form

ai-draft · 4 tasks · 19 fields

Sync, upload and list objects in S3-compatible storage. Other commands (buckets, ACLs, policies, CloudFront) and credential switches are left out; configure access with s3cmd --configure.

Opens the form; the finished command lands at your prompt, unrun

Run in Otty

otty gui s3cmd

`s3cmd sync`

Synchronize

Synchronize a directory tree to S3, from S3, or between buckets.

SynchronizeExample values, fixed in this page — nothing here reaches a terminal

Basic

Source*

string

Destination*

string

Dry run set by task

--dry-run

Delete removed files

--delete-removed

Advanced

Exclude glob

string

Include glob

string

TasksEach one presets the form for one job

Preview a sync

sourcedestinationdry_rundelete_removedexcludeinclude

Sync

sourcedestinationskip_existingdelete_removedexcludeincludeacl_public

ParametersOnly these flags are editable in the form

Source

Local directory or s3://BUCKET[/PREFIX].
string · positional 0

Destination

Local directory or s3://BUCKET[/PREFIX].
string · positional 1

Dry run

boolean

--dry-run-n

Delete removed files

Delete destination objects with no corresponding source file.
boolean

--delete-removed

Skip existing

boolean

--skip-existing

Compare sizes only

Do not check MD5 sums; faster but may miss changed files.
boolean

--no-check-md5

Exclude glob

string · repeatable

--exclude

Include glob

string · repeatable

--include

Public-read ACL

boolean

--acl-public-P

`s3cmd put`

Upload files

Put files into a bucket.

Upload filesExample values, fixed in this page — nothing here reaches a terminal

Basic

Files*

any

Destination*

string

Recursive

--recursive

Advanced

Public-read ACL

--acl-public

Storage class

string

TasksEach one presets the form for one job

Upload files

filesdestinationrecursiveacl_publicstorage_class

ParametersOnly these flags are editable in the form

Files

path · positional 0 · repeatable

Destination

s3://BUCKET[/PREFIX]
string · positional 1

Recursive

boolean

--recursive-r

Dry run

boolean

--dry-run-n

Force overwrite

boolean

--force-f

Public-read ACL

boolean

--acl-public-P

Storage class

string

--storage-classSTANDARDSTANDARD_IAGLACIERDEEP_ARCHIVE

`s3cmd ls`

List objects or buckets

List objects or buckets.

List objects or bucketsExample values, fixed in this page — nothing here reaches a terminal

Basic

Bucket or prefix

string

Recursive

--recursive

Human-readable sizes

--human-readable-sizes

TasksEach one presets the form for one job

List

targetrecursivehuman

ParametersOnly these flags are editable in the form

Bucket or prefix

s3://BUCKET[/PREFIX]; empty lists all buckets.
string · positional 0

Recursive

boolean

--recursive-r

Human-readable sizes

boolean

--human-readable-sizes-H

SourcesEvery flag above is checked against these

man

s3cmd sync LOCAL_DIR s3://BUCKET[/PREFIX] or s3://BUCKET[/PREFIX] LOCAL_DIR or s3://BUCKET[/PREFIX] s3://BUCKET[/PREFIX] -n, --dry-run --skip-existing --delete-removed --no-check-md5 --exclude=GLOB --include=GLOB -P, --acl-public --progress

manual2026-10-27

github.com

man

s3cmd put FILE [FILE...] s3://BUCKET[/PREFIX] -n, --dry-run -f, --force -r, --recursive -P, --acl-public --storage-class=CLASS --progress

manual2026-10-27

github.com

man

s3cmd ls [s3://BUCKET[/PREFIX]] -r, --recursive -H, --human-readable-sizes

manual2026-10-27

github.com

Before it fills your prompt, Otty checks the installed s3cmd against its version. A form that does not match your version is not offered.