---
title: "David Cao (@linux732) | Hashnode"
description: "Owner of howtouselinux.com. I work as a Linux engineer for over 20 years. Now I am a technical blogger and Software Engineer. I enjoy sharing learning and co..."
url: "https://hashnode.com/@linux732"
---

@linux732

# David Cao

@linux732 · Joined March 2021

## Comments

[Chidiogo The article is very clear. I really enjoy it. Thanks. If you are interested in adding some links to this article, please let me know. Thanks.](https://hashnode.com/posts/managing-users-and-permissions-in-linux/63671c278bbfcb988d011506/comment/63749924e1d53a5fd290db02)

Comment · Article · Nov 16, 2022 · [Managing Users and Permissions in Linux](https://hashnode.com/posts/managing-users-and-permissions-in-linux/63671c278bbfcb988d011506)

[Thanks for the article. We can use tcpdump command to capture tcp packets and learn more about what TCP packets look like. We can also capture particular TCP packets based on the TCP flag like syn, ack, etc.](https://hashnode.com/posts/what-is-a-tcp/6000fee1c162d710c9b15abe/comment/607bd452c99e200d08f7c1e8)

Comment · Article · Apr 18, 2021 · [What is a TCP?](https://hashnode.com/posts/what-is-a-tcp/6000fee1c162d710c9b15abe)