The Linux Filesystem Hierarchy Explained

The Linux Filesystem Explained

1 min readPublished 22 Jul 2026

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Unlike Windows with its drive letters, Linux has one unified filesystem starting at / (root). Learning where things live is half of Linux.

Interactive explainer

The Linux Filesystem Hierarchy

One unified tree from / — no drive letters, everything is a file.

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/ (root)

The top of everything.

Linux has a single unified tree starting at / — there are no drive letters like C:. Everything, including devices, is a file somewhere under /.

Check your understanding

1. Where do system-wide configuration files live?

2. How are extra disks made available in Linux?

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The Linux Filesystem The Linux Shell CompTIA A+ CompTIA Security+

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Key directories

/etc — system-wide configuration.
/home — users' personal files (/root for the admin).
/var — variable data, including logs in /var/log.
/bin, /usr/bin — programs; /tmp — temporary files.

Extra disks are mounted into the tree (e.g. /mnt/data) rather than appearing as separate drives. This connects to permissions and the shell.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

Navigating the filesystem is the most basic Linux skill employers check.

Technical questions

Explain the Linux filesystem hierarchy.+

One tree from /; /etc config, /home users, /var logs, /bin programs; disks are mounted in.

Behavioural questions

Tell me about picking up Linux.+

Show a structured approach: filesystem first, then shell, permissions and services.

Real-world scenarios

“You need to find why a service failed.”+

Expected answer: Head to /var/log or journalctl — knowing where logs live speeds diagnosis.

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Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles

Linux AdministratorCloud EngineerSOC Analyst

Skills you're proving

Linux filesystemNavigationTroubleshooting

Recommended certifications

CompTIA Security+

Career progression

Linux Fundamentals → cloud/DevOps/security roles.

What employers expect

That you can navigate, administer and troubleshoot Linux from the command line.

Frequently asked questions

Does Linux use drive letters like C:?

No — it has a single tree from /, and extra disks are mounted into it at a directory.

Where are logs stored?

Under /var/log (and via journald), essential for troubleshooting.

Where is system configuration?

In /etc, holding system-wide configuration files.

Practise what you've learned

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