Can one specify the default region for the EC2 command line tools using a variable?

Question

Is there an EC2_* environment variable to specify the default region of the EC2 command line tools in order to avoid specifying the --region eu-west-1 option for each command?

Answer 1

for Latest AWS CLI:

export AWS_DEFAULT_REGION=eu-west-1

reference:

http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html

for older EC2 CLI:

export EC2_URL=https://ec2.eu-west-1.amazonaws.com

reference:

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/SettingUp_CommandLine.html

http://docs.aws.amazon.com/general/latest/gr/rande.html