On a Linux or Unix-like system, open a terminal and run uname -s. It prints the system name, but it may not identify a Linux distribution. On Linux, check /etc/os-release for the distribution name and version. On a Mac, choose Apple menu > About This Mac to see the macOS name and version.
These checks identify an operating system or system family; they do not, by themselves, prove formal UNIX certification. “PC” often means a Windows computer, but Linux machines and Macs can also be personal computers.
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Check a Linux or Unix-like system from the terminal
Print the system name
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Open a terminal on the system you want to identify.
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Run
uname -s. -
Read the result as the system name reported by that implementation. Linux commonly reports
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The POSIX uname utility writes the operating-system name by default. Running uname -a requests additional system characteristics, but the available options and details can vary between implementations.
Find the Linux distribution and version
A result of Linux identifies the kernel/system name, not necessarily the distribution installed on the computer. On Linux, inspect /etc/os-release for distribution information. In that file, PRETTY_NAME is intended as a display name; ID and VERSION_ID are machine-readable identifiers when present.
For example, a reader can display the file in a terminal with cat /etc/os-release. The format permits some fields to be absent, and vendors may add others, so do not assume every system supplies every field.
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Check macOS without mistaking it for Linux
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Choose Apple menu > About This Mac.
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Read the macOS name and version shown in the window.
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Click the version number to reveal the build number.
A terminal on a Mac may report Darwin with uname -s. That is not a Linux distribution name; About This Mac is the straightforward user-facing check for the macOS release.
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What each check tells you
|
Check |
Where |
What it identifies |
What it does not establish |
|---|---|---|---|
|
|
Terminal |
System name |
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|
|
|
Terminal |
System name plus additional characteristics provided by that implementation |
A definitive distribution identity or certification status Rank #4 |
|
|
Linux system file |
Distribution identity and version fields when supplied |
Formal UNIX certification |
|
About This Mac |
Mac user interface |
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|
Linux distribution identity |
|
The Open Group UNIX register |
Certification register |
Whether a product/version is listed as UNIX certified Best Value
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It is not a substitute for identifying the OS installed on your own computer |
Unix-like, Linux-based, and UNIX-certified are different claims
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Linux-based means the operating system uses the Linux kernel. To find the distribution and version, prefer
/etc/os-releaseover guessing from the kernel name. -
Unix-like describes systems with Unix-style behavior or interfaces; it is broader than Linux. A familiar shell, terminal, or command does not alone prove the computer runs Linux.
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UNIX certified is a formal status attached to specific products and versions in The Open Group register. Do not infer certification from a command result or Unix-like behavior. The register has listed macOS 15.0 Sequoia for both Apple silicon and Intel-based Mac computers; certification listings can change, so consult the current register for current status.
If the computer is running Windows
A Windows computer does not become Linux-based merely because a terminal or shell offers Unix-style commands. First identify the operating system Windows itself reports; if you are using a Linux environment inside Windows, distinguish that environment from the host operating system. This article’s supplied verified checks do not establish a current Windows Settings navigation path, so use current Microsoft Support instructions for the exact Windows UI labels rather than relying on an assumed path.
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