About UnixTools.com

UnixTools.com is a free, independent site with Unix and Linux tutorials, command examples and security guides.

A little history

The site began in the early 2000s as a consultant's notebook. Vennerable Consulting, who had worked on Unix machines since 1980, collected the articles and links they used to train staff and solve problems on customer systems, and published them here. Its guide to securing HP-UX was linked from thousands of university, company and hobbyist pages. Later owners added a Veritas Cluster section, vendor pages and a lot of material about web hosting.

By the time the old site went quiet, most of it described systems that are now retired: IRIX, DG/UX, Tru64, SUSE Linux Enterprise 9 and 10, LILO, runlevels. In 2026 every page was rewritten from scratch for the systems people run today. The old addresses still work and lead to the matching new page.

How the guides are written

• Commands are written for current Linux distributions (Debian 13, Ubuntu 26.04 LTS, RHEL 10 and compatible) with notes where the BSDs, macOS, AIX or Solaris differ.
• Examples are tested in a shell before they are published. Commands that change or delete data are marked.
• Version numbers and support dates were checked against the vendors' own pages when the page was last reviewed. Each page shows that date.
• External links go to official documentation, projects and well-known free learning sites. Nobody pays to be listed and there are no affiliate links.

Contact

Found a mistake, a dead link or an example that does not work on your system? Write to contact@iban.com and mention the page. To suggest a resource for the link lists, use the suggestion page.

UnixTools.com cannot log in to your systems or provide hands-on support. For a production problem, contact your vendor's support or a local consultant.

Disclaimer

The guides are general information. Test changes on a non-production system first, keep backups, and follow your organisation's change process. UnixTools.com is not affiliated with IBM, Oracle, HPE, SUSE, Red Hat, Canonical, Arctera, Cloud Software Group, Cohesity or any other company named on the site. Product names are trademarks of their owners.