Amazon S3 Command Line Tool for Mac OS X QuickStart
The Tutorial Shows You Step-by-Step How-to Install, Set-Up and Getting-Started with s3cmd the S3 Sync Command Line Tool for Mac OS X 10.11 El Capitan Desktop/Server.
S3cmd is a free command line tool and client for uploading, retrieving and managing data in Amazon S3 and other cloud storage service providers that use the S3 protocol, such as Google Cloud Storage or DreamHost DreamObjects.
This is Very Useful Command Line Tool will Enable Synchronization of Local Folders/Directories with the Amazon AWS S3 Buckets and without a Risk of Canceling the Existing Remote Data.
The Post Includes all Commands and Links Needed to Successfully Installing s3cmd on Mac OS X 10.11 El Capitan.

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Download Latest s3cmd Tool for Mac OS X:
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Double-Click on Archive to Extract
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Open a Command Line Terminal Window
(Press “Enter” to Execute Commands) -
Installing Required Gnupg
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To install gnupg by Macports:
sudo port install gnupg
The “port” Command Require a Macports Installation!
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To install gnupg by Brew:
brew install gpg
The “brew” Command Require a HomeBrew Installation!
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Installing Required Python Gnupg Extension
sudo pip install python-gnupg
The “pip” Command Require a Pip Installation!
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Installing S3cmd
cd $HOME/Downloads/s3cmd*
sudo python setup.py install
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Setting Up s3cmd
s3cmd --configure
You Will Need to Enter your Amazon AWS S3 Credentials.
More you will need to Confirm All the Proposed Settings.
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Quick Getting-Started with s3cmd: