What is the difference between internal command and external command in Linux?

What is the difference between AWS's Python awscli bundle and the general linux AWS command line tools (e.g. ec2-describe-instances)?

Answer:

The Python command line tools feel a lot more like a unified suite of tools in much the same way that the git suite feels like a unified suite of tools. Secondly, the Python command line tools support a much wider range of services and APIs than the old ec2 tools. Thirdly, the Python command line tools are written in Python instead of Java, which makes them start up a lot faster. This is not that noticeable on fast desktops or larger instances, but on instances like the m1.small and t1.micro, the older Java tools are so very slow to start, which is a problem for a command line tool. Finally, the Python command line tools are newer and I believe they are intended to obsolete the old Java tools.

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Other answers

The AWS Command Line Interface (awscli) is a unified replacement for all of the older, service-specific command line tools. Where previously you had to install EC2 tools independently of S3 tools independently of SNS tools, for example, now you can simply install awscli and it can be used to manage all services. The older, service-specific tools were written in Java, used the AWS Java SDK, and were delivered in binary format. The newer, unified tools are written in Python, use the boto Python package, and are delivered in source format. An example of using the old tools: ec2-describe-instances An example of using the new tools: aws ec2 describe-instances You can read more at http://aws.typepad.com/aws/2013/09/new-aws-command-line-interface-cli.html and download the new tool at http://aws.amazon.com/cli/.

Jarmo Dee

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