It was officially released before I knew it, so I will summarize it

Premise

Macports must be installed
Python must be installed (Python versions 2.6.x or higher, 3.3.x or lower)
If you have git-core installed, Python should be included

Installation

Check installed Python

$ sudo port installed | grep py
  git-core @1.8.4_0+credential_osxkeychain+doc+pcre+python27 (active)
  python27 @2.7.5_1 (active)
・ ・ ・

Install pip corresponding to python version with macports (enter because setuptools also depends)

$ sudo port install py27-pip

Install the pip module from your package management system

$ sudo easy_install pip

install aws-cli

$ sudo pip install awscli

Setting

Enable autocomplete for subcommands

 $ complete -C aws_completer aws

Check aws settings

Open the AWS Management Console
Check the Access Key ID and Secret Access Key with Security Credentials, etc.
Check the region name from Availability Zone Status of EC2 Dashboard (example: value with the end of ap-northeast-1a, ap-northeast-1 is the region name)

Do either method

Environment variables
Config file
IAM Role

For Environment variables

$ export AWS_ACCESS_KEY_ID=<access_key>
$ export AWS_SECRET_ACCESS_KEY=<secret_key>

For Config file

With this method, you can write for each environment by specifying porfile.

[default]
aws_access_key_id=<default access key>
aws_secret_access_key=<default secret key>
# Optional, to define default region for this profile.
region=<Region name>

[profile testing]
aws_access_key_id=<testing access key>
aws_secret_access_key=<testing secret key>
region=<Region name>

$ export AWS_CONFIG_FILE=/path/to/config_file

For IAM Role

If you install and use aws-cli on your EC2 instance, and you are using IAM, it seems that it will automatically use your Access Key ID and Secret Access Key.

Try it out

Environment variables, IAM Role

$ aws ec2 describe-instance-status --region <Region name>

For Config file

When using profile testing

$ aws ec2 describe-instance-status --profile=testing

Official site

https://github.com/aws/aws-cli

Install aws-cli on MacPorts

Premise

Installation

Check installed Python

Install pip corresponding to python version with macports (enter because setuptools also depends)

Install the pip module from your package management system

install aws-cli

Setting

Enable autocomplete for subcommands

Check aws settings

Do either method

For Environment variables

For Config file

For IAM Role

Try it out

Environment variables, IAM Role

For Config file

Official site