The /lib directory in Linux holds critical system libraries and kernel modules required for the core functionality of the operating system. Think of these libraries as building blocks that essential programs and commands rely on to work properly.

For example, when you run commands from /bin or /sbin, those commands often need shared libraries stored in /lib to execute successfully.

Additionally, /lib contains kernel modules, which are pieces of code that can be loaded into the kernel when needed, such as drivers for hardware devices. Without the /lib directory, most commands and even the Linux kernel itself wouldn’t function correctly.

It is especially vital during the early stages of booting because the system depends on /lib before other filesystems like /usr are even mounted. For Linux+ candidates, understanding the role of /lib helps connect how Linux commands, system processes, and hardware interact seamlessly.

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