101 Linux commands is an open-source, MIT-licensed eBook that teaches the 101 Linux commands everyone should know, written for DevOps and SysOps engineers, developers, and Linux enthusiasts who will have to use the terminal at some point in their careers.

What it is

The project is a book of 101 Linux commands, published as open-source content out of a GitHub repository and distributed as downloadable release artefacts, with an online copy served from GitHub Pages. Its repository description and tagline also call it a CLI tool, and it lives in the Linux and DevOps documentation space alongside the author's other Leanpub titles. The content itself is written in HTML, and the repository is primarily a publishing pipeline rather than a program.

The concrete problem it solves is that terminal commands are normally learned one at a time, usually at the moment someone needs one, from man pages or scattered notes. This project collects the commands into a single curated reference, organised by category and by chapter, and hands it over in a format the reader chooses. It replaces the piecemeal scavenging of command syntax with one maintained document that can be read cover to cover or consulted by topic, and it does so at no cost under the MIT licence rather than through a paid channel — the paid titles linked from the repository are the author's separate Leanpub eBooks, not this one.

Key capabilities

• Downloads published in four formats per release: 101-linux-commands-light.pdf for printing and desktop reading, 101-linux-commands-dark.pdf for dark-mode readers, 101-linux-commands.epub for e-readers, tablets, and mobile devices, and 101-linux-commands.html as a single-page web version.
• An online copy is served from bobbyiliev.github.io/101-linux-commands/, so no download is required to read it.
• Commands are indexed by category, covering Directory Navigation, File Commands, File and Directory Manipulation, package archive and compression tools, System commands, Networking Commands, Package Management, User Information commands, Session commands, Getting Help, and Applications.
• A chapter index adds Disk and File System Management, General Disk Manipulation (non-LVM), Globs (Wildcards), Regex, stream redirection, Text Readers and Editors, Less, VI, User and Group Management, File System Permissions, SSH, and Cronjobs.
• Package management is broken out by ecosystem, with dedicated RPM and YUM sections rather than one generic chapter.
• The Basics chapter documents the File Hierarchy Standard as a table, mapping /bin, /boot, /etc, /lib, /sbin, /var, /usr, /proc, /sys, /mnt, /media, /home, and /run to their contents.

Who uses it and how

• DevOps and SysOps engineers, developers, and Linux enthusiasts, which the README names directly as the intended audience.
• Readers who need a working Linux machine to try commands on; the README points to a DigitalOcean referral link offering credit for a test virtual machine.
• Mobile and e-reader readers who take the EPUB, dark-mode readers who take the dark PDF, and readers who want a single browseable page and take the HTML build.
• Contributors, particularly during Hacktoberfest — the repository carries the hacktoberfest topic and a Contributing section.
• Beginners who want more groundwork before the command list, directed by the README to the companion Introduction to Linux eBook on Leanpub.

Getting started

There is no install command, package, or container image; the README only offers download links. Take the latest PDF, EPUB, or HTML from the Releases page, or read the online copy directly in a browser.

How it compares

The facts provided name no competing tools and no list of paid products this project replaces, so it stands alone in this registry on that axis. The only adjacent titles mentioned are the author's own Leanpub eBooks, which are companions rather than substitutes.

When to use it — and when not to

There is nothing to operate: no database, object storage, mail server, or application runtime is involved, and the artefacts are static files, so a self-hoster's only real work is hosting a copy of the published output. Anyone expecting an interactive CLI tool should look elsewhere, because the README documents no installable binary, command name, or invocation, despite the repository description and tagline describing one. The scope is also deliberately introductory — 101 commands for terminal users — so it will not serve as a deep reference for advanced administration.