PractiCLI
Built for CompTIA Linux+ XK0-006

Linux+ lab online — practice the Linux shell in your browser

Manage services, storage and networking on faithfully simulated shells, break realistic faults and fix them, and drill performance-based tasks — all in a browser tab. No VM to build, no cloud bill, no ISO to download. It even runs on a Chromebook.

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Free to start · no card required · boots in under a second

The CompTIA Linux+ XK0-006 rewards one thing above all: being fluent and confident at the shell. Reading about systemctl, lvcreate or journalctl is not the same as typing them under pressure. PractiCLI gives you a faithfully simulated Linux command line — Debian, Ubuntu and RHEL-style systems — where supported commands behave the way they do on the exam and on a production server.

The XK0-006 blueprint

What you practice in the Linux+ lab

Every exam domain, worked on a live shell, verified with real output, and broken on purpose so you learn to fix it.

System management

systemd units, the boot process and GRUB2, kernel modules, processes and shell operations.

Storage

LVM and RAID, partitions, ext4/XFS filesystems, mounts and a correct /etc/fstab.

Networking

Addressing with ip and nmcli, routing, DNS, open ports with ss, and SSH.

Services & users

Local accounts and sudo, software packages, scheduled jobs, systemd services and containers.

Security

Permissions and ownership, firewalls, SSH hardening, SELinux/AppArmor and account hardening.

Troubleshooting & automation

Logs with journalctl, performance diagnostics, and bash scripting with grep, sed and awk.

100+
guided labs
400+
faults to troubleshoot
900+
PBQ-style questions
10+
vendors & platforms
The method

Three ways to train, not just a sandbox

A path from guided configuration to diagnosing a fault you can't yet see — the way the exam and the job actually test you.

01 · Guided labs

Build it, step by step

Scenarios with clear objectives and automatic checks: you configure a service or a volume, you verify, and the lab confirms whether it's correct.

02 · Fault troubleshooting

Break it, fix it

A realistic fault is injected — a failed service, a wrong fstab, a blocked port — a ticket opens, and it closes only when you actually fix it.

03 · PBQ practice

Pass the exam tasks

Performance-based questions in exam style: not multiple choice, but tasks to carry out on the shell, with scoring.

Current exam · hands-on by design

Linux+ XK0-006 is a performance-based exam

CompTIA retired XK0-005 on 13 January 2026, so XK0-006 is now the only Linux+ exam — and it's more practical than before, with live performance-based questions where you work directly in a terminal. The surest way to prepare for a hands-on exam is to spend more time on a faithfully simulated shell, reproducing commands and faults until they are automatic. That is exactly what PractiCLI is built for.

Honest comparison

Why not just spin up a VM?

A local VM or a cloud box is real Linux — but it leaves all the hard parts to you.

VM / cloud box

  • Hours of setup and maintenance before you learn anything
  • You have to invent and break scenarios yourself
  • No guided objectives, no automatic checking
  • No performance-based (PBQ) tasks or scoring
  • Cloud instances cost money while they run

PractiCLI

  • Opens in the browser, even on a Chromebook
  • 400+ break/fix faults ready to diagnose
  • Guided labs with automatic verification
  • 900+ PBQ-style questions with scoring
  • One plan, 10+ vendors and platforms

PractiCLI focuses on the command line, adds break/fix troubleshooting and exam-style questions, and the same plan grows with you well beyond Linux. See simulation vs emulation for how the engine works.

Pricing & plans Frequently asked questions Create a free account
// FAQ

Linux+ lab — common questions

Do I need to install a VM?
No. The Linux lab opens in a browser tab — no VirtualBox, no cloud instance, no ISO to download. There is nothing to set up or maintain, so it works on light machines and Chromebooks too.
Is this good practice for the CompTIA Linux+ XK0-006?
Yes. The Linux track covers the XK0-006 domains — System Management, Troubleshooting, Services & Users, Security and Automation — with guided labs, fault troubleshooting and PBQ-style tasks that mirror the exam's hands-on style.
Which distributions and topics does it cover?
You practice on Debian, Ubuntu and RHEL-style systems: systemd services, networking (ip, nmcli, ss), storage (LVM, RAID, fstab, ext4/XFS), users and permissions, SSH, firewalls and SELinux/AppArmor, logs and performance troubleshooting, and bash scripting.
Will it help with the performance-based questions (PBQs)?
Yes. Linux+ XK0-006 includes performance-based questions where you work in a live terminal. PractiCLI is built for exactly that: repeating real commands and fixing realistic faults on the shell until they are automatic.

Start your Linux+ lab in the browser

Open a Linux shell, fix a realistic fault, and see how the exam-style tasks feel — free, with no card required.

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