Linux System and Kernel Interview Questions – 100+ Topics and Code Examples

This article compiles more than one hundred interview questions and detailed answers about Linux operating systems and kernel internals. It covers basic concepts such as common Linux distributions, package management commands ( dpkg --list , yum list installed ), system monitoring tools ( top , df , netstat ), and the boot process.

It also dives into deeper topics like process creation, inter‑process communication mechanisms (pipes, sockets, shared memory), virtual memory management, file‑system structures (inode, hard/soft links), and kernel‑level operations such as system calls ( read() , write() ) and their internal workflow.

The guide provides extensive C/C++ examples, illustrating language features relevant to system programming: static variables, static functions, virtual functions, smart pointers, type conversions, and the use of static and volatile . Code snippets demonstrate common algorithms (binary‑tree depth, quicksort, linked‑list sorting) and data‑structure implementations (stack, queue, STL containers).

Additional sections discuss advanced subjects such as page replacement algorithms (FIFO, LRU, LFU), memory alignment, endianness detection, and low‑level hardware interfaces (SPI, I2C). The article also explains development tools and processes, including the GCC compilation flow (preprocessing, compiling, assembling, linking) and the role of bootloaders, RTOS schedulers, and interrupt controllers in embedded systems.

Overall, the content serves as a thorough reference for candidates preparing for Linux‑related technical interviews and for engineers seeking a solid refresher on operating‑system fundamentals and practical system‑level programming.