The Linux Standard Base (LSB) was a Linux Foundation specification intended to make compiled applications more portable between Linux distributions. Its Common specification defined shared APIs, ABIs and installation-script expectations, while an architecture supplement supplied processor-specific requirements. LSB is now historical: the final approved series is archived, Debian discontinued support, and Red Hat no longer requires LSB compliance.
What the LSB Common Specification defined
The LSB Common 5.0 scope described the project as defining “a system interface for compiled applications and a minimal environment for support of installation scripts.” In practical terms, it tried to give software vendors a predictable target that participating distributions could implement.
LSB covered two related layers:
- Application programming interfaces (APIs): functions and interfaces that source code can call.
- Application binary interfaces (ABIs): the compiled-program contract, including calling conventions, symbol names and versions, libraries and other runtime expectations.
That ABI focus distinguished LSB from a source-only portability guide. A program built for an LSB-defined target could, in principle, use the same compiled interface on any distribution implementing the relevant specification.
How the specification was assembled
The Common document did not describe every hardware target by itself. A complete interface for compiled software required the Common specification plus the supplement for the processor architecture in question. The Common part defined shared requirements; the supplement handled architecture-specific details.
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LSB modules
| Module | Purpose | Relationship |
|---|---|---|
| LSB Core | Foundational components and interfaces | All other modules depend on Core |
| LSB Desktop | Desktop-related interfaces | Built on the common base |
| LSB Languages | Runtime-language interfaces | Built on the common base |
| LSB Imaging | Printing and scanning interfaces | Built on the common base |
| LSB Trial Use | Candidate components that were not yet mandatory | Not part of the mandatory interface |
For example, an x86-64 application target required the common requirements together with the x86-64 architecture supplement. Reading only the Common document would not provide the complete processor-specific contract.
LSB release history
| Series | Release date | Position |
|---|---|---|
| LSB 4.0 | May 1, 2009 | Earlier specification series |
| LSB 4.1 | February 16, 2011 | Later 4.x revision |
| LSB 5.0 | June 3, 2015 | Approved final specification series in the Linux Foundation archive |
No later LSB series is identified in the official archive. The documents remain useful when maintaining software that was designed around the standard, but they should not be treated as a current baseline for new Linux deployments.
Is LSB still supported on Linux?
Not as a current, broadly required compatibility target. Support ended at the distribution level rather than through one universal removal event.
| Distribution or project | Current position described by its documentation | What that means |
|---|---|---|
| Debian | Debian describes LSB as obsolete and discontinued support. Its FAQ says that after Debian 8 Jessie, the project abandoned pursuit of LSB compatibility. | Do not assume a modern Debian system provides the LSB environment or utilities expected by older software. |
| Red Hat Enterprise Linux | RHEL has not adhered to or been required to be LSB-compliant since RHEL 8. Required utilities and libraries were deprecated in RHEL 8 and removed in RHEL 9. | LSB-dependent installation scripts and binaries need a separate compatibility plan on current RHEL releases. |
Consequently, an application cannot claim modern Linux-wide portability merely because it once met an LSB requirement. Each target distribution and release must be evaluated on its own interfaces and dependencies.
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LSB and the Filesystem Hierarchy Standard (FHS) addressed separate compatibility problems. LSB described interfaces used by applications and their compiled binaries; FHS described where files and directories belong in a Unix-like filesystem.
| Comparison | LSB | FHS |
|---|---|---|
| Primary scope | Application APIs, ABIs, libraries and runtime expectations | Filesystem directory and file placement |
| Main question | “Which interfaces can this compiled program rely on?” | “Where should this file or directory be located?” |
| Hardware treatment | Common rules plus architecture-specific supplements | Filesystem-layout rules rather than processor ABI rules |
| Relationship | Application-interface specification | Separate filesystem-layout standard |
Following FHS conventions does not make a binary LSB-compatible, and an LSB-oriented application contract does not determine every path on a system.
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What to use instead of lsb_release for distribution identity
For basic distribution and version metadata, Red Hat recommends reading /etc/os-release instead of relying on lsb_release. A shell check is:
cat /etc/os-releaseThe file normally exposes machine-readable fields such as the distribution identifier, human-readable name and version information. Treat it as identification metadata, not as proof that a system implements any particular ABI. If a legacy script invokes lsb_release, check whether that command is installed on each supported distribution and migrate the script’s identification logic to the fields available in /etc/os-release.
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Can one Linux binary run across distributions?
Sometimes, but only under defined conditions. LSB was designed to make that possible when all of the following aligned:
- The distributions implemented the same LSB requirements.
- The binary targeted the same processor architecture and its corresponding architecture supplement.
- The program used interfaces covered by that LSB contract.
- The required runtime libraries and installation-script environment were present.
Those conditions are not a general guarantee on current Linux systems. Modern distributions are not uniformly required to implement LSB, and a binary can depend on interfaces, libraries or versions outside the old specification. Therefore, “built on Linux” is not enough to predict cross-distribution execution; compatibility must be checked for the exact binary, architecture, distribution and release.
Practical outcomes
| Situation | Likely result |
|---|---|
| Two systems implement the same LSB target and architecture requirements | The standard was intended to allow the same compiled application to run on both. |
| A current distribution does not provide required LSB libraries or utilities | An older LSB-dependent binary or installer may fail even if the CPU architecture matches. |
| The binary uses distribution-specific or newer interfaces | LSB documentation alone cannot establish portability. |
Guidance for maintaining LSB-era software
- Identify the actual target. Record the binary’s architecture, the distribution releases it must support and whether the installer expects LSB utilities.
- Inspect distribution identity with
/etc/os-release. Use the file’s identifiers and version fields for branching logic rather than assuminglsb_releaseis available. - Map runtime dependencies. List the libraries, symbols and runtime-language components the program actually needs; do not infer availability from the presence of an LSB document.
- Test every supported release. Debian and RHEL have different LSB histories, and their current packages and compatibility components are not interchangeable.
- Keep legacy and modern paths separate. If an old installer must remain usable, isolate its compatibility handling instead of presenting LSB as a current universal standard.
For new software, treat LSB as historical reference material. Define support against named distributions, releases, architectures and dependencies, and use the operating system’s current identity metadata for installation decisions.
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