SyntaxFix

[amazon-web-services] Error You must specify a region when running command aws ecs list-container-instances

"You must specify a region" is a not an ECS specific error, it can happen with any AWS API/CLI/SDK command.

For the CLI, either set the AWS_DEFAULT_REGION environment variable. e.g.

export AWS_DEFAULT_REGION=us-east-1

or add it into the command (you will need this every time you use a region-specific command)

AWS_DEFAULT_REGION=us-east-1 aws ecs list-container-instances --cluster default

or set it in the CLI configuration file: ~/.aws/config

[default]
region=us-east-1

or pass/override it with the CLI call:

aws ecs list-container-instances --cluster default --region us-east-1

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