The SSH Config File: The Shortcut You're Not Using
Master ~/.ssh/config: Host aliases, HostName, User, Port, IdentityFile, ProxyJump. Stop typing long SSH commands. One-line setup.
Tag: linux
All the articles with the tag "linux".
Why kill -9 Is the Wrong Default
Signals explained: SIGTERM vs SIGKILL, graceful shutdown, and when to actually use kill -9.
The umask You've Been Ignoring
Understand Linux umask: what it is, how 022 and 027 work, calculating file permissions, and why it matters for shared directories and security.
/proc as a Debugging Tool
The /proc filesystem is a live window into every running process on Linux. Debug PIDs, file descriptors, memory, and limits with no extra tools installed.
zram vs Swap: What's Actually Faster for Low-RAM Servers
Compare zram (compressed RAM) and traditional swap files. Learn when each works, setup, and real-world performance trade-offs for memory-constrained systems.
strace for Beginners: See What Any Process Is Doing
Use strace to trace system calls and debug mysterious permission errors, missing files, and network issues without ever reading source code.
Using the Clipboard from the Linux Terminal
Copy and paste from the Linux terminal without a mouse. Master xclip, xsel, wl-copy, and integrate clipboard with tmux and SSH.
lsof: The Tool That Shows You Everything
Master lsof to find port conflicts, trace deleted files eating disk, and debug network connections.
CPU and I/O Priority with nice and ionice
Manage Linux process priority with nice (CPU) and ionice (I/O). Learn priority levels, renice running processes, and avoid tanking server performance.
Linux File Descriptor Limits: When 1024 Isn't Enough
File descriptors and why that 1024 limit kills your server. How to check, raise, and debug fd exhaustion.
The `at` Command: One-Time Scheduled Tasks in Linux
Schedule one-off Linux tasks with `at` instead of cron. Learn syntax, queue management, batch jobs, and when to use it for delayed reboots and reminders.
Why Your Docker Container Ignores Ctrl+C
PID 1 doesn't receive signals by default. Learn why Ctrl+C fails in containers and fix it with tini or exec form CMD.