# s6

> service supervision suite for UNIX-like operating systems

**Wikidata**: [Q109312415](https://www.wikidata.org/wiki/Q109312415)  
**Source**: https://4ort.xyz/entity/s6

## Summary
s6 is a free, open-source service supervision suite designed for UNIX-like operating systems. It provides tools for managing and monitoring system services, ensuring they run reliably and restart automatically if they fail. Distributed under the ISC license, s6 is part of the broader ecosystem of free software and is widely used in system administration and init processes.

## Key Facts
- **License**: s6 is distributed under the ISC license, a permissive free software license.
- **Version**: As of April 2, 2023, the latest version is 2.11.3.2.
- **Website**: The official website is [https://skarnet.org/software/s6/](https://skarnet.org/software/s6/), available in English.
- **Classification**: s6 is classified as both free software and an init system.
- **Dependencies**: s6 requires the `make` utility, a standard UNIX tool for build automation, which was first introduced in April 1976.
- **Source Code**: The source code repository is hosted at [https://git.skarnet.org/cgi-bin/cgit.cgi/s6/](https://git.skarnet.org/cgi-bin/cgit.cgi/s6/), using the cgit interface.
- **Package Availability**: s6 is available as a package in various distributions, including MacPorts (`s6`), Gentoo Wiki (`S6`), and SlackBuilds (`system/s6`).
- **Copyright Status**: s6 is copyrighted but freely distributable under its license terms.
- **Wikidata Description**: Described as a "service supervision suite for UNIX-like operating systems."
- **Repology Project Name**: Listed as `s6` in the Repology project database.
- **Wikipedia Presence**: Has a Wikipedia article in Spanish (`es`).

## FAQs

**What is s6 used for?**
s6 is a service supervision suite designed to manage and monitor system services on UNIX-like operating systems. It ensures that services run continuously and restart automatically if they crash or fail, making it a critical tool for system reliability and administration.

**Is s6 free software?**
Yes, s6 is classified as free software, meaning users are free to run, study, modify, and distribute it under the terms of the ISC license. This aligns with the principles of the free software movement, which emphasizes user freedom and open collaboration.

**What are the system requirements for s6?**
s6 requires the `make` utility, a standard UNIX tool for build automation that has been in use since April 1976. This dependency is essential for compiling and installing s6 from its source code.

**Where can I find the source code for s6?**
The source code for s6 is hosted in a public repository at [https://git.skarnet.org/cgi-bin/cgit.cgi/s6/](https://git.skarnet.org/cgi-bin/cgit.cgi/s6/), accessible via the cgit interface. This allows developers to contribute, audit, or modify the codebase.

**How is s6 distributed?**
s6 is available as a package in several distributions, including MacPorts (`s6`), Gentoo Wiki (`S6`), and SlackBuilds (`system/s6`). This makes it easy to install and integrate into different UNIX-like systems.

## Why It Matters
s6 plays a crucial role in modern system administration by providing a robust framework for service supervision. In UNIX-like operating systems, services often need to run continuously, and s6 ensures their reliability by automatically restarting them if they fail. This is particularly important for servers, where downtime can lead to significant disruptions. By being free software, s6 empowers users to customize and adapt it to their specific needs, fostering innovation and collaboration within the open-source community. Its integration with tools like `make` and availability across multiple distributions further solidifies its place as a key component in system management.

## Notable For
- **Service Supervision**: s6 is specifically designed for supervising services, ensuring they remain operational and restart automatically upon failure.
- **Free Software**: As part of the free software ecosystem, s6 adheres to principles of user freedom and open collaboration.
- **UNIX Compatibility**: Built for UNIX-like systems, s6 integrates seamlessly with existing tools and workflows.
- **ISC License**: The use of the ISC license makes s6 accessible and modifiable for a wide range of users and developers.
- **Integration with `make`**: s6 depends on `make`, a long-standing and widely used UNIX utility, ensuring compatibility and ease of use.
- **Cross-Distribution Availability**: s6 is packaged for multiple distributions, including MacPorts, Gentoo, and SlackBuilds, making it widely accessible.

## Body

### Overview
s6 is a service supervision suite tailored for UNIX-like operating systems. It provides tools and mechanisms to manage system services, ensuring their continuous operation and automatic recovery in case of failures. This makes s6 an essential component for system administrators and developers who require reliable service management.

### License and Distribution
s6 is distributed under the ISC license, a permissive free software license that allows users to run, study, modify, and distribute the software freely. This aligns with the broader free software movement, which emphasizes user freedom and open collaboration. The ISC license is known for its simplicity and compatibility with other open-source licenses, making s6 accessible to a wide audience.

### Version and Development
As of April 2, 2023, the latest version of s6 is 2.11.3.2. The development of s6 is ongoing, with updates and improvements regularly released to enhance its functionality and reliability. The source code is publicly available, allowing developers to contribute to its evolution.

### Dependencies
s6 requires the `make` utility, a standard UNIX tool for build automation. `make` has been in use since April 1976 and is essential for compiling and installing s6 from its source code. This dependency ensures that s6 can be built and deployed on a wide range of UNIX-like systems.

### Source Code and Repository
The source code for s6 is hosted in a public repository at [https://git.skarnet.org/cgi-bin/cgit.cgi/s6/](https://git.skarnet.org/cgi-bin/cgit.cgi/s6/), accessible via the cgit interface. This repository allows developers to access, audit, and modify the codebase, fostering a collaborative development environment.

### Package Availability
s6 is available as a package in several distributions, including:
- **MacPorts**: Listed as `s6`.
- **Gentoo Wiki**: Listed as `S6` (English, ID: 108144).
- **SlackBuilds**: Listed as `system/s6`.

This wide availability makes it easy to install and integrate s6 into different UNIX-like systems, enhancing its accessibility and usability.

### Classification and Role
s6 is classified as both free software and an init system. As an init system, s6 plays a critical role in the boot process and service management of UNIX-like operating systems. Its classification as free software underscores its commitment to user freedom and open collaboration.

### Copyright Status
s6 is copyrighted but freely distributable under the terms of the ISC license. This ensures that while the software is protected, users have the freedom to use, modify, and distribute it as needed.

### Community and Documentation
s6 has a presence in the open-source community, with documentation and resources available on its official website and through various package managers. The Spanish Wikipedia article on s6 (`es`) provides additional information and context for Spanish-speaking users.

### Related Projects and Ecosystem
s6 is part of a broader ecosystem of free software and service supervision tools. Its integration with `make` and availability across multiple distributions highlights its role in the UNIX-like systems landscape. The use of the ISC license and public source code repository further solidifies its place in the open-source community.

### Technical Details
s6 is designed to be lightweight and efficient, making it suitable for a wide range of UNIX-like systems. Its service supervision capabilities ensure that critical services remain operational, reducing downtime and enhancing system reliability. The use of the ISC license and public source code repository allows for customization and adaptation to specific needs.

### Future Developments
The ongoing development of s6, with regular updates and improvements, ensures that it remains a relevant and reliable tool for service supervision. The public source code repository and collaborative development environment foster innovation and continuous improvement, making s6 a valuable asset for system administrators and developers.

## References

1. [Source](https://git.skarnet.org/cgi-bin/cgit.cgi/s6/)