XK0-006 System Management Practice Question
Which of the following directories is defined by the Filesystem Hierarchy Standard (FHS) as containing essential user command binaries that need to be available in single-user mode?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
/bin
/bin contains essential command binaries required for booting and single-user mode.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
/sbin
Why it's wrong here
/sbin contains system administration binaries needed for booting, recovery and repair, not the essential user command binaries the stem describes. It is tempting because single-user mode is administrative, but the FHS assigns general user commands to /bin instead.
- ✗
/opt/bin
Why it's wrong here
/opt/bin is not defined by the FHS at all; /opt holds add-on application packages, each in its own subtree. It is tempting because third-party software often installs binaries under /opt, but FHS reserves essential single-user-mode command binaries for /bin.
- ✗
/usr/bin
Why it's wrong here
/usr/bin holds most user commands, but the FHS places it on a separate filesystem that may be unavailable in single-user mode. It is tempting because it contains the bulk of everyday executables, yet the stem requires binaries guaranteed present during single-user recovery, which /bin provides.
- ✓
/bin
Why this is correct
/bin holds essential user command binaries required for single-user mode, such as ls, cp and sh. The FHS reserves it precisely for binaries needed before /usr is mounted, satisfying the single-user availability constraint. Other directories like /usr/bin hold non-essential binaries that may depend on separate mounts.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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