The /usr directory in Linux holds the majority of user-level applications, libraries, documentation, and system utilities that are not required during the initial stages of booting.
While its name might suggest it’s for user files, it’s actually more like a shared, read-only part of the system for application files and binaries.
Subdirectories like /usr/bin, /usr/sbin, and /usr/lib store essential programs and libraries used once the system is fully up and running.
For instance, nano, python3, and many user-accessible commands are located in /usr/bin.
The /usr/share directory contains icons, documentation, and other shared files, while /usr/local is reserved for locally compiled software to avoid conflicts with package-managed system files.
The screenshot below shows a terminal session where the user lists the contents of the /usr/bin/ directory using the ls command, revealing a large number of installed executable programs.
The error in the first command occurs because /usr/bin/ is a directory, and trying to execute it directly without ls or another command causes Bash to return an error.
On the Linux+ exam, understanding /usr is important because it helps clarify how Linux separates system-critical startup tools (found in /bin, /sbin) from everyday programs that live in /usr.
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