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CompTIA Linux+ — Practice Questions flashcards

6 of 60 questions free to study here · 4 topics · the whole deck is built into Willys

Multiple-choice practice questions, one best answer each, on systemd, packages, LVM, users and permissions, SSH, sudo, SELinux, firewalls, scripting, containers and troubleshooting.

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Practice deck · part of CompTIA Linux+ · written against: Current Linux+ exam objectives (topics common to XK0-005 and its successor). Updated 2026-10-10.

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  1. A developer compiles a monitoring tool from source on a production server. Its files must not collide with files owned by the distribution's packages. Where should the tool be installed?

    A) Under /srv
    B) Under /usr/share
    C) Under /usr/bin
    D) Under /usr/local
    D) Under /usr/local

    By FHS convention /usr/local is for locally built software that the package manager does not track, so package updates never touch it. /usr/bin belongs to the distribution's packages, and an update could overwrite or conflict with files placed there.

    Not in the CompTIA Linux+ 2026 outline; background only.
    System Management › Filesystem Hierarchy
  2. An application writes scratch files that must still be there after the server reboots. Which directory suits them?

    A) /run
    B) /tmp
    C) /dev/shm
    D) /var/tmp
    D) /var/tmp

    /var/tmp is meant for temporary files that persist across reboots. /tmp may be cleared at every boot and is often a RAM-backed tmpfs, and /run and /dev/shm are RAM-backed as well.

    Not in the CompTIA Linux+ 2026 outline; background only.
    System Management › Filesystem Hierarchy
  3. User alice must also join the docker group without losing any of her existing supplementary groups. Which command does this?

    A) usermod -G docker alice
    B) useradd -G docker alice
    C) usermod -g docker alice
    D) usermod -aG docker alice
    D) usermod -aG docker alice

    -a appends to the supplementary group list. -G on its own replaces the whole list, and -g changes her primary group; she must log in again before the new membership applies.
    Security › Users and Groups
  4. A help-desk technician has reset user bob's password and wants the system to make bob choose a new one at his next login. Which command does this?

    A) chage -l bob
    B) usermod -L bob
    C) chage -E 0 bob
    D) chage -d 0 bob
    D) chage -d 0 bob

    chage -d 0 sets the last password change to day zero, so the password counts as expired and must be changed at login. chage -E 0 expires the whole account, which blocks login altogether.
    Security › Users and Groups
  5. A cron job runs ./backup.sh, and both its normal output and its error messages must end up in backup.log. Which command line does this?

    A) ./backup.sh > backup.log 1>&2
    B) ./backup.sh > backup.log 2>&1
    C) ./backup.sh 2> backup.log
    D) ./backup.sh 2>&1 > backup.log
    B) ./backup.sh > backup.log 2>&1

    Redirections are processed left to right: stdout goes to the file first, then 2>&1 points stderr at the same place. Written the other way round, stderr is copied from stdout before stdout is redirected, so errors still go to the old destination.
    Scripting Containers and Automation › Bash Scripting
  6. Which command shows only messages of priority error and more severe from the current boot?

    A) journalctl -b -p err
    B) journalctl -k -p err
    C) journalctl -b -1 -p err
    D) journalctl -f -p err
    A) journalctl -b -p err

    -b limits the output to the current boot and -p err to error and higher priorities. -b -1 selects the previous boot instead, and -k shows only kernel messages.
    Troubleshooting › Logs

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System Management and ScriptingSecurity and Troubleshooting

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About these cards

Review status: Second-reader reviewed, with corrections applied.

Checked against:

  • CompTIA Linux+ exam objectives — topic outline only; no text copied. Tags follow the four XK0-005 domains; as of October 2026 the current exam is XK0-006 (launched 2025-07-15), and XK0-005 retired on 2026-01-13.

These are independent study notes written for Willys. They are not official exam material, may contain mistakes, and are no substitute for your course, your teacher or the exam owner's own publications. Found an error? Tell us — corrections ship as a new version of the deck.

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