XK0-006 System Management Practice Question
Which directory in the Filesystem Hierarchy Standard (FHS) contains essential user commands available to all users, such as 'ls' and 'cp'?
⚠ Common exam trap
XK0-006 often tests the FHS distinction between /bin and /usr/bin, and candidates pick /usr/bin because it contains the same commands, forgetting that /bin is specifically for essential commands available during early boot and 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
The /bin directory in the FHS contains essential user commands that must be available in single-user mode and for all users, such as ls, cp, mv, and cat. These binaries are required for basic system operation and are on the root filesystem so they are available even when other filesystems are not mounted. This matches the question's description precisely.
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 binaries intended for administrative use, typically reserved for root, so it does not hold commands available to all users. It is correct when placing utilities needed for booting, recovery, and system repair.
- ✗
/opt
Why it's wrong here
/opt stores add-on application software packages, each in its own subtree, so it does not hold core user commands like ls and cp. It is correct when installing third-party or self-contained vendor software outside the distribution's package management.
- ✓
/bin
Why this is correct
/bin holds essential user binaries such as ls and cp, required for single-user mode and all users. The FHS reserves /sbin for system administration binaries and /usr/bin for non-essential user commands, so /bin uniquely satisfies the stem's requirement for essential commands available to everyone.
- ✗
/usr/bin
Why it's wrong here
/usr/bin holds non-essential user commands installed by packages, not the essential commands needed for single-user or recovery boot. It is the correct location when packaging ordinary application binaries that all users may run, but not for the FHS-defined essential set.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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