XK0-006 System Management Practice Question
Which directory in the FHS contains essential user command binaries that are needed in single-user mode?
⚠ Common exam trap
Watch out — candidates often confuse /sbin with /bin, assuming all essential binaries are in /sbin, but /sbin is specifically for system administration tools, while /bin holds the user command binaries required 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
The /bin directory, as defined by the Filesystem Hierarchy Standard (FHS), contains essential user command binaries (e.g., ls, cp, mv) that are required for booting, repairing, and operating the system in single-user mode. Single-user mode mounts only the root filesystem, so /bin must be on the root partition to provide these critical utilities without relying on other filesystems like /usr.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
/usr/bin
Why it's wrong here
/usr/bin holds non-essential user binaries installed by packages, not the single-user-mode rescue set; those live in /bin. It is tempting because most everyday commands (editors, compilers, utilities) reside there, so it looks comprehensive, but it is the wrong FHS location for essential boot-critical binaries.
- ✗
/sbin
Why it's wrong here
/sbin holds system binaries for administration and boot, but essential user command binaries needed in single-user mode reside in /bin. /sbin is correct when the requirement concerns system administration utilities such as fsck or ip, not user commands.
- ✗
/opt/bin
Why it's wrong here
/opt/bin is reserved for add-on application packages installed under /opt, not FHS-mandated essential binaries. It is tempting because third-party software often places executables there, but no single-user-mode rescue commands are guaranteed in that path, so it cannot satisfy the requirement.
- ✓
/bin
Why this is correct
/bin holds essential user command binaries required for single-user mode and system repair, such as ls, cp and cat. It is distinct from /sbin, which holds system administration binaries, and /usr/bin, which holds non-essential user commands.
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