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Copying files in AWS S3 bucket


Learning to copy files to S3 bucket or from S3 bucket to local folder is a must thing to learn when administering S3 bucket.

S3 bucket is an object storage.  See details on this link: https://aws.amazon.com/s3/features/

An S3 policy called WORM (write-once read-many) policy can be enforced to S3 bucket.

WORM is ideal for log files.  Backup or write the log file once and read it many times if someone needs to read or review the logs.

Let’s get into business, how to copy files to S3 bucket?

S3 is an acronym for Simple Storage Service.

S3 accepts Linux command, so if you are running Windows be careful when typing S3 commands.

A simple mistake of running Capital letters can ruin your day since the command will not work and the error won’t be friendly to tell you that it was just a simple mistake that you just type in capital letter.

Copying is plain simple, so here’s a basic and simple example:

aws s3 cp test_bucket.txt s3://thes3bucket  

s3 – is small letter it’s not S3. If S3 is typed on the command line, then an error will occur.

s3://thes3bucket – notice that the bucket name is directly typed right after s3://

The command copies test_bucket.txt to the bucket called “thes3bucket”.

Note, the command above works in Windows or Linux system.

To verify if the file has been copied. Type:

aws s3 ls s3://thes3bucket  

If the command is successfully, then it will display the contents of the bucket with the file that was copied, the “test_bucket.txt”.

What if you need to copy a file to a sub-folder within the AWS S3 bucket?

There’s no magic on it, just type the whole folder path.

Example, if the bucket is like this:  thes3bucket is the main folder and there is a sub folder call sub_folder_s3_bucket

So, to copy files to this sub folder the command will be like this:

aws s3 cp test_bucket_2_subfolder.txt s3://thes3bucket/sub_folder_s3_bucket


Note, that “/” forward slash was used rather than back slash.

The above command will work both in Windows and Linux system.

The examples are copying a file from local folder to S3 bucket.

The syntax is something like this:

aws cp       


To copy from AWS S3 bucket to local folder, then the syntax will be like this:

aws cp  


Example:

aws s3 cp s3://thes3bucket/test_bucket.txt .

The test_bucket.txt file will be copied the current folder no need to specify the folder name since “.” or the dot specifies the current path.


If the file is in a subfolder then the command will be like this:

aws s3 cp s3://thes3bucket/sub_folder_s3_bucket/test_bucket_2_subfolder.txt .

This will copy the file test_bucket_2_subfolder.txt located on sub_folder_s3_bucket to the current directory.

Above examples just copy a single file if need to copy a lot of files then the --recursive option can be used.

AWS S3 bucket also has the “sync” option which sync all files, so both folder on the source and destination will be the same.

aws s3 cp s3://the_S3_Bucket/dir_folder localdir --recursive


Above will copy all the bucket to the local folder.

To sync:
aws s3 sync . s3://the_S3_Bucket


Above will sync the current directory to S3 bucket, so basically, it’s like uploading the current directory to AWS s3 bucket cloud.

That’s it. Till next time.


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