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# AMI contents for an AWS Cloud9 EC2 Development Environment
Use the following information to get details about Amazon Machine Images (AMIs) that AWS Cloud9 uses for an EC2 environment.
**Important**
If your environment's Amazon EC2 instance is based on an Amazon Linux 2023 AMI or Amazon Linux 2 AMI template, security updates are installed on the instance immediately after it's launched. And security patches are then automatically applied to the instance every hour. These updates are applied by a background process and don't affect your use of the instance.
For an Ubuntu EC2 environment, security updates are also installed on the instance immediately after it's launched. Then the `unattended-upgrades` package automatically installs available updates daily.
**Topics**
+ [
## Amazon Linux 2023/Amazon Linux 2
](#ami-contents-amazon-linux)
+ [
## Ubuntu Server
](#ami-contents-ubuntu-server)
## Amazon Linux 2023/Amazon Linux 2
**Important**
We recommend that you choose the **Amazon Linux 2023** option when [creating an Amazon EC2 environment using the console](create-environment-main.md#create-environment-console). As well as providing a secure, stable, and high-performance runtime environment, Amazon Linux 2023 AMI includes long-term support through 2024.
To display the version of an Amazon Linux instance, run the following command from the AWS Cloud9 IDE for the connected environment or from an SSH utility such as the **ssh** command or PuTTY.
```
cat /etc/system-release
```
To display a list of packages that are installed on an Amazon Linux instance, run one or more of the following commands.
To display all installed packages as a single list:
```
sudo yum list installed
```
To display a list of installed packages with package names containing the specified text:
```
sudo yum list installed | grep YOUR_SEARCH_TERM
```
In the preceding command, replace `YOUR_SEARCH_TERM` with some portion of the package name. For example, to display a list of all installed packages with names containing `sql`:
```
sudo yum list installed | grep sql
```
To display a list of all installed packages, displayed one page at a time:
```
sudo yum list installed | less
```
To scroll through the displayed pages:
+ To move down a line, press **j**.
+ To move up a line, press **k**.
+ To move down a page, press **Ctrl-F**.
+ To move up a page, press **Ctrl-B**.
+ To quit, press **q**.
**Note**
With Amazon Linux 2, you can use the Extras Library to install application and software updates on your instances. These software updates are known as topics. For more information, see [Extras library (Amazon Linux 2)](https://docs.aws.amazon.com/linux/al2/ug/al2-extras.html) in the *Amazon EC2 User Guide*.
For additional options, run the **man yum** command. See also the following resources:
+ Amazon Linux 2023: [AMI page]().
+ Amazon Linux: [Amazon Linux AMI 2018.03 Packages](https://aws.amazon.com/amazon-linux-ami/2018-03-packages/).
## Ubuntu Server
To display the version of an Ubuntu Server instance, run the following command from the AWS Cloud9 IDE for the connected environment or from an SSH utility such as the **ssh** command or PuTTY.
```
lsb_release -a
```
The version will display next to the **Description** field.
To display a list of packages that are installed on an Ubuntu Server, run one or more of the following commands.
To display all installed packages as a single list:
```
sudo apt list --installed
```
To display a list of installed packages with package names containing the specified text:
```
sudo apt list --installed | grep YOUR_SEARCH_TERM
```
In the preceding command, replace `YOUR_SEARCH_TERM` with some portion of the package name. For example, to display a list of all installed packages with names containing `sql`:
```
sudo apt list --installed grep sql
```
To display a list of all installed packages, one page at a time:
```
sudo apt list --installed | less
```
To scroll through the displayed pages:
+ To move down a line, press **j**.
+ To move up a line, press **k**.
+ To move down a page, press **Ctrl-F**.
+ To move up a page, press **Ctrl-B**.
+ To quit, press **q**.
For additional options, run the **man apt** command. See also [Ubuntu Packages Search](https://packages.ubuntu.com/) on the Ubuntu website.