Filesystem hierarchy (FHS): Which directory is designated for user system resources, including subdirectories for user and administrative executables such as /usr/bin and /usr/sbin?

Introduction / Context:
The Linux Filesystem Hierarchy Standard (FHS) defines a common directory structure across distributions. Knowing where executables and libraries reside helps administrators manage software, PATH settings, and storage.

Given Data / Assumptions:

• We are identifying the standard location of user and administrative executables.
• We focus on system-provided software, not temporary files or mount points.
• FHS conventions are followed.

Concept / Approach:

The /usr hierarchy holds user system resources: binaries in /usr/bin, system admin binaries in /usr/sbin, libraries in /usr/lib, and shared data in /usr/share. Locally installed admin/user software typically goes under /usr/local. /opt is for add-on packages; /tmp is for temporary files; /mnt is a mount point.

Step-by-Step Solution:

Verification / Alternative check:

List directories with ls /usr to confirm existence of bin, sbin, lib, share, and local. Consult man hier or FHS documentation for definitions.

Why Other Options Are Wrong:

• /tmp: Temporary files; not for installed executables.
• /opt: Optional add-on packages; not the primary hierarchy for user/admin executables.
• /mnt: Generic mount point; not for program storage.
• None of the above: Incorrect because /usr is correct.

Common Pitfalls:

Confusing /usr with /usr/local or /opt. While programs can exist in all three, /usr is the principal tree for distribution-provided binaries and libraries, whereas /usr/local is for locally installed software and /opt is for third-party add-ons.

Final Answer:

/usr