# Getting started

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/aws-cli-user-guide.git)
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## Install/Update

* **Important**\
  AWS CLI versions 1 and 2 use the same `aws` command name. If you previously installed AWS CLI version 1, see [Migrating from AWS CLI version 1 to version 2](https://github.com/kevinslin/aws-reference-notes/blob/main/services/aws_command_line_interface_aws_cli/cliv2-migration.md).
* **Important**\
  The warning in the output is expected and doesn't indicate a problem. It occurs because there isn't a chain of trust between your personal PGP key (if you have one) and the AWS CLI PGP key. For more information, see [Web of trust](https://wikipedia.org/wiki/Web_of_trust).
* **Note**\
  When updating from a previous version, the `unzip` command prompts to overwrite existing files. To skip these prompts, such as with script automation, use the `-u` update flag for `unzip`. This flag automatically updates existing files and creates new ones as needed.
* **Note**\
  To update your current installation of the AWS CLI, add your existing symlink and installer information to construct the `install` command with the `--update` parameter.
* **Note**\
  You can view debug logs for the installation by pressing **Cmd+L** anywhere in the installer. This opens a log pane that enables you to filter and save the log. The log file is also automatically saved to `/var/log/install.log`.

## Past releases

* **Important**\
  The warning in the output is expected and doesn't indicate a problem. It occurs because there isn't a chain of trust between your personal PGP key (if you have one) and the AWS CLI PGP key. For more information, see [Web of trust](https://wikipedia.org/wiki/Web_of_trust).
* **Note**\
  To update your current installation of the AWS CLI version 2 to a newer version, add your existing symlink and installer information to construct the `install` command with the `--update` parameter.
* **Important**\
  The warning in the output is expected and doesn't indicate a problem. It occurs because there isn't a chain of trust between your personal PGP key (if you have one) and the AWS CLI PGP key. For more information, see [Web of trust](https://wikipedia.org/wiki/Web_of_trust).
* **Note**\
  You can view debug logs for the installation by pressing **Cmd+L** anywhere in the installer. This opens a log pane that enables you to filter and save the log. The log file is also automatically saved to `/var/log/install.log`.