Linux

You deleted a large log, the directory became smaller, but df -h still reports a full filesystem. Before deleting anything else, check whether a runni...

An open port scan tells you that something answered; it does not tell you whether the listener is expected or safe to stop. Identify the local process...

On a system with persistent journaling, systemd journal files can occupy a noticeable share of /var. First measure their size and confirm whether the ...

A server clock that drifts can confuse logs, authentication, certificate checks and scheduled jobs. Before manually setting the time, identify which s...

systemctl --failed lists systemd units whose state is recorded as failed. It is a useful starting point, but a failed unit does not always mean the ma...

Flatpak, Snap and AppImage are ways to distribute desktop applications across Linux environments. They can reduce dependence on one distribution's pac...

When a Linux filesystem is filling up, start by finding which directories account for the space. df reports filesystem usage; du estimates space used ...

There is no single Linux distribution that is best for every server and desktop. The useful comparison starts with the job: hosting a long-lived servi...

journalctl queries the systemd journal. When a service fails to start, narrow the search by unit, time, and priority instead of reading the entire his...

A process that remains visible after kill -9 is not necessarily ignoring SIGKILL. If its state is D, the task is blocked inside an uninterruptible ker...