Comprehensive Overview of Linux: Processes, Memory Management, Filesystems, I/O, and Security
This article provides an in‑depth technical guide to Linux, covering its Unix heritage, process and thread creation, kernel architecture, virtual memory, scheduling algorithms, file‑system structures, I/O handling, networking, and built‑in security mechanisms such as user IDs, permissions, and set‑UID features.
Linux, derived from UNIX, is presented as a multi‑user operating system that runs on a wide range of hardware, from embedded devices to supercomputers.
The article explains how processes are created with fork and replaced with exec , how threads share the same task structure, and how the kernel distinguishes between user and kernel mode.
Memory management is detailed through virtual memory, paging, the buddy allocator, and the Completely Fair Scheduler, showing how pages are mapped, swapped, and protected.
File‑system concepts are covered from the VFS abstraction to ext2/ext4 structures, directory entries, inode metadata, and mounting, including network file systems like NFS.
I/O is described via character and block devices, the role of the generic block layer, caching strategies, and socket‑based networking using TCP/UDP.
Security mechanisms such as UID/GID, permission bits, the super‑user, and set‑UID/GID are outlined, along with relevant system calls like chmod , chown , and access .
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