Blog | timerring

The /proc in Linux is a kind of Pseudo file system (also known as Virtual File System), what it saves is a series of special files that store the current running state of the kernel, and the user can check the hardware info and the runnning processes via the files, even adjust some files to change the state of running kernel. The files in /proc will be refresh in RAM, so the files’ size is 0 bytes.

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The Iftop

January 30, 2025 · 1 min read · Page View:

Tutorial

Linux | Network

I frequently use ifconfig and cat /proc/net/dev to examine network information. However, today, my cloud server crashed unexpectedly. I reached out to the cloud support for assistance. The engineer utilized iftop to analyze the situation. After the issue was resolved, I started to consider using this tool. Now, let’s take a closer look at this powerful utility.

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Some Useful Commands to Share

January 30, 2025 · 0 min read · Page View:

Cheatsheet

Commands

Some good commands to share.

Note: This post will be updated regularly.

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Random Variables

January 28, 2025 · 2 min read · Page View:

Tutorial

Math | Probability | Random Process

This article introduces the common distribution functions both continuous and discrete. Besides, the basic knowledge of conditional distribution such as total probability and Bayes’ Theorem is also introduced. The most important part are the Normal Approximation and Poisson Approximation of the Binomial Random Variable.

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