Which C Version Does the Linux Kernel Use? C90, C99, or C11 – Explained
The Linux kernel, the heart of the world’s most widely used operating system, is written primarily in C. As a cornerstone of modern computing, its design...
Posts for 2026-01
Posts published in this month
How to Fix 'sudo Group Doesn't Exist' Error When Running usermod on CentOS 7: Create Sudo Group Correctly
If you’ve ever tried to grant sudo privileges to a user on CentOS 7 by running `usermod -aG sudo <username>`, you might have encountered the frustrating error:...
How to Fix 'stdin: is not a tty' SSH Error When Executing Remote Commands Through Another Machine
If you’ve ever tried to run a remote command over SSH—especially through intermediate machines (e.g., jump hosts)—you may have encountered the frustrating...
How to Show Job Count in Bash Prompt Only When Nonzero (Avoid Clutter)
The Bash shell prompt (`PS1`) is more than just a static string—it’s a dynamic tool that can provide real-time context to boost your productivity. One common...
How to Show Current Git Branch with Coloring in Linux Terminal (Like Git Bash on Windows)
If you’ve used Git Bash on Windows, you’ve likely noticed its handy feature: the terminal prompt automatically displays the current Git branch you’re working...
How to Show Complete Arguments in strace (Even with Curly Brackets) When -s Isn't Enough
`strace` is an indispensable tool for debugging and understanding how programs interact with the Linux kernel. It traces system calls (syscalls) and signals,...
How to Show All Keys in Redis in One Line: Fixing the 'redis-cli keys *' Error
Redis, the popular in-memory data store, is widely used for caching, session management, and real-time analytics. A common task when working with Redis is...
Should We Use Multiple Acceptor Sockets for Large Connections? SO_REUSEPORT Benefits & NGINX Case Study
In the era of cloud computing, microservices, and high-traffic web applications, handling **millions of concurrent connections** is no longer a niche...
Child Process Termination: exit vs return vs _exit in fork() - Which Should You Use?
When working with process creation in Unix-like systems, the `fork()` system call is a cornerstone, enabling the creation of new child processes. However,...
Should the FUSE getattr Operation Always Be Serialised? Implications for RESTful API-Backed Filesystems
Filesystems are the backbone of how we interact with data, but traditional filesystems are bound to local storage. Today, with the rise of cloud storage and...