Command option Sample:aws iam set-default-policy-version

Search command sample in the internet.It is the result.

Sets the specified version of the specified policy as the policy'sdefault (operative) version.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/iam/set-default-policy-version.html

aws iam set-default-policy-version --policy-arn arn:aws:iam::123456789012:policy/MyPolicy --version-id v2
    set-default-policy-version — AWS CLI 1.16.7 Command Reference : http://docs.aws.amazon.com/cli/latest/reference/iam/set-default-policy-version.html
aws iam set-default-policy-version \
    Setting the Default Version of a Managed Policy - Documentation - Outscale : http://wiki.outscale.net/display/DOCU/Setting+the+Default+Version+of+a+Managed+Policy

aws のオプション一覧