Using the os-release standard - Amazon Linux 2
Key differencesField types/etc/os-release examplesComparison with other distributions
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Using the os-release standard

Amazon Linux complies with the os-release standard for identifying Linux distributions. This file provides machine-readable information about the operating system identification and version information.

Note

The standard dictates that /etc/os-release is attempted to be parsed first, followed by /usr/lib/os-release. Care should be taken to follow the standard around file names and paths.

Key identification differences

The os-release is found at /etc/os-release, and if that is not present, at /usr/lib/os-release. Consult the os-release standard for complete information.

The most reliable way to determine an instance is running Amazon Linux is to check the ID field in os-release.

The most reliable way to determine distinguish between versions is to check the VERSION_ID field in os-release:

  • Amazon Linux AMI: VERSION_ID contains a date-based version (e.g., 2018.03)

  • AL2: VERSION_ID="2"

  • AL2023: VERSION_ID="2023"

Note

Remember that VERSION_ID is a machine-readable field intended for programmatic use, while PRETTY_NAME is designed for display to users. See Field types: Machine-readable vs. Human-readable for more information about field types.

Field types: Machine-readable vs. Human-readable

The /etc/os-release file (or /usr/lib/os-release if /etc/os-release does not exist) contains two types of fields: machine-readable fields intended for programmatic use, and human-readable fields intended for presentation to users.

Machine-readable fields

These fields use standardized formats and are intended for processing by scripts, package managers, and other automated tools. They contain only lowercase letters, numbers, and limited punctuation (periods, underscores, and hyphens).

  • ID – Operating system identifier. Amazon Linux uses amzn across all versions, distinguishing it from other distributions like Debian (debian), Ubuntu (ubuntu), or Fedora (fedora)

  • VERSION_ID – Operating system version for programmatic use (e.g., 2023)

  • ID_LIKE – Space-separated list of related distributions (e.g., fedora)

  • VERSION_CODENAME – Release codename for scripts (e.g., karoo)

  • VARIANT_ID – Variant identifier for programmatic decisions

  • BUILD_ID – Build identifier for system images

  • IMAGE_ID – Image identifier for containerized environments

  • PLATFORM_ID – Platform identifier (e.g., platform:al2023)

Human-readable fields

These fields are intended for display to users and may contain spaces, mixed case, and descriptive text. They should be used when presenting operating system information in user interfaces.

  • NAME – Operating system name for display (e.g., Amazon Linux)

  • PRETTY_NAME – Full operating system name with version for display (e.g., Amazon Linux 2023.8.20250721)

  • VERSION – Version information suitable for user presentation

  • VARIANT – Variant or edition name for display (e.g., Server Edition)

Other informational fields

These fields provide additional metadata about the operating system:

  • HOME_URL – Project homepage URL

  • DOCUMENTATION_URL – Documentation URL

  • SUPPORT_URL – Support information URL

  • BUG_REPORT_URL – Bug reporting URL

  • VENDOR_NAME – Vendor name

  • VENDOR_URL – Vendor URL

  • SUPPORT_END – End-of-support date in YYYY-MM-DD format

  • CPE_NAME – Common Platform Enumeration identifier

  • ANSI_COLOR – ANSI color code for terminal display

When writing scripts or applications that need to identify Amazon Linux programmatically, use the machine-readable fields like ID and VERSION_ID. When displaying operating system information to users, use the human-readable fields like PRETTY_NAME.

/etc/os-release examples

The /etc/os-release file content varies between Amazon Linux versions:

AL2023
[ec2-user ~]$ cat /etc/os-release
NAME="Amazon Linux"
VERSION="2023"
ID="amzn"
ID_LIKE="fedora"
VERSION_ID="2023"
PLATFORM_ID="platform:al2023"
PRETTY_NAME="Amazon Linux 2023.8.20250721"
ANSI_COLOR="0;33"
CPE_NAME="cpe:2.3:o:amazon:amazon_linux:2023"
HOME_URL="https://aws.amazon.com/linux/amazon-linux-2023/"
DOCUMENTATION_URL="https://docs.aws.amazon.com/linux/"
SUPPORT_URL="https://aws.amazon.com/premiumsupport/"
BUG_REPORT_URL="https://github.com/amazonlinux/amazon-linux-2023"
VENDOR_NAME="AWS"
VENDOR_URL="https://aws.amazon.com/"
SUPPORT_END="2029-06-30"
AL2
[ec2-user ~]$ cat /etc/os-release
NAME="Amazon Linux"
VERSION="2"
ID="amzn"
ID_LIKE="centos rhel fedora"
VERSION_ID="2"
PRETTY_NAME="Amazon Linux 2"
ANSI_COLOR="0;33"
CPE_NAME="cpe:2.3:o:amazon:amazon_linux:2"
HOME_URL="https://amazonlinux.com/"
SUPPORT_END="2026-06-30"
Amazon Linux AMI
[ec2-user ~]$ cat /etc/os-release
NAME="Amazon Linux AMI"
VERSION="2018.03"
ID="amzn"
ID_LIKE="rhel fedora"
VERSION_ID="2018.03"
PRETTY_NAME="Amazon Linux AMI 2018.03"
ANSI_COLOR="0;33"
CPE_NAME="cpe:/o:amazon:linux:2018.03:ga"
HOME_URL="http://aws.amazon.com/amazon-linux-ami/"

Comparison with other distributions

To understand how Amazon Linux fits within the broader Linux ecosystem, compare its /etc/os-release format with other major distributions:

Fedora
[ec2-user ~]$ cat /etc/os-release
NAME="Fedora Linux"
VERSION="42 (Container Image)"
RELEASE_TYPE=stable
ID=fedora
VERSION_ID=42
VERSION_CODENAME=""
PLATFORM_ID="platform:f42"
PRETTY_NAME="Fedora Linux 42 (Container Image)"
ANSI_COLOR="0;38;2;60;110;180"
LOGO=fedora-logo-icon
CPE_NAME="cpe:/o:fedoraproject:fedora:42"
DEFAULT_HOSTNAME="fedora"
HOME_URL="https://fedoraproject.org/"
DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/f42/system-administrators-guide/"
SUPPORT_URL="https://ask.fedoraproject.org/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Fedora"
REDHAT_BUGZILLA_PRODUCT_VERSION=42
REDHAT_SUPPORT_PRODUCT="Fedora"
REDHAT_SUPPORT_PRODUCT_VERSION=42
SUPPORT_END=2026-05-13
VARIANT="Container Image"
VARIANT_ID=container
Debian
[ec2-user ~]$ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
Ubuntu
[ec2-user ~]$ cat /etc/os-release
PRETTY_NAME="Ubuntu 24.04.2 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04.2 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo

Notice how the machine-readable fields provide consistent identification across distributions:

  • ID – Uniquely identifies the operating system: amzn for Amazon Linux, fedora for Fedora, debian for Debian, ubuntu for Ubuntu

  • ID_LIKE – Shows distribution relationships: Amazon Linux uses fedora (AL2023) or centos rhel fedora (AL2), while Ubuntu shows debian to indicate its Debian heritage

  • VERSION_ID – Provides machine-parseable version information: 2023 for AL2023, 42 for Fedora, 12 for Debian, 24.04 for Ubuntu

In contrast, the human-readable fields are designed for display to users:

  • NAME – User-friendly OS name: Amazon Linux, Fedora Linux, Debian GNU/Linux, Ubuntu

  • PRETTY_NAME – Complete display name with version: Amazon Linux 2023.8.20250721, Fedora Linux 42 (Container Image), Debian GNU/Linux 12 (bookworm), Ubuntu 24.04.2 LTS

  • VERSION – Human-readable version with additional context like codenames or release types

When writing cross-platform scripts, always use the machine-readable fields (ID, VERSION_ID, ID_LIKE) for logic and decisions, and use the human-readable fields (PRETTY_NAME, NAME) only for displaying information to users.