Security of linux [toc] Linux Secure? Linux can be configured in a way that it is as secure as every other OS out there Linux can be configured nearly any way to be configured provides pitfa...

file systems [toc] Basics file system? Responsible for managing the files on a device. What does a file system need to do? Keep track of where the file is File Length Ownership Fil...

Deploy systems [toc] Virtualization on enterprise LINUX KVM provides Overcommit of physical resources. (CPU, RAM, Hard drive space) agent on guest to communicate with hypervisor. (host can ...

users and accounts [toc] Linux 用户和用户组管理 Linux系统是一个多用户多任务的分时操作系统，任何一个要使用系统资源的用户，都必须首先向系统管理员申请一个账号，然后以这个账号的身份进入系统。 用户的账号 一方面可以帮助系统管理员对使用系统的用户进行跟踪，并控制他们对系统资源的访问； 另一方面也可以帮助用户组织文...

network network network in linux Manually adding Routes to check Routes setup networking on Ubuntu add a machine to ...

Linux distributions [toc] which one phones: Android routers: DDWRT security: Kali Linux Internet: Nest, Raspberry Pi privacy,: Tails intro Linux distributions use a package management system t...

linux boot process A Linux system goes through several stages when booting. the firmware stage the computer runs code in BIOS or UEFI during power on self test or post. Older computers hav...

file access control [toc] Permissions 更改文件属性 The Unix-like operating systems, differ from other computing systems in that they are not only multitasking but also multi-user. more than one user...

[toc] Daemons also known as background processes a Linux or UNIX program that runs in the background. Almost all daemons have names that end with the letter “d”. For example, ...

CentOS [toc] check Version $ cat /etc/os-release $ cat /etc/centos-release CentOS Linux release 8.1.1911 (Core) Setup kernel check the exact version of kernel uname -a. check the kerne...

linux vi/vim [toc] Linux vi/vim 所有的 Unix Like 系统都会内建 vi 文书编辑器，其他的文书编辑器则不一定会存在。 vi 是老式的字处理器，不过功能已经很齐全了，但是还是有可以进步的地方。 vim 则可以说是程序开发者的一项很好用的工具。具有程序编辑的能力，可以主动的以字体颜色辨别语法的正确性，方便程序设计。 vim 键盘图： ...

sed (“stream editor”) parses and transforms text, using a simple, compact programming language. most notably with the substitution command. Popular alternative tools for plaintext string ma...

Linux - Sysfile [toc] /etc/passwd $ sudo cat /etc/passwd ---------------------------------------------- Username, password, uid, gid, comment, home directory, default shell -------------------...

PAM [toc] PAM = Pluggable Authentication Modules PAM Services 4 types of PAM services: Authentication service modules. Account management modules. Session management modules. Password ...

Linux Socket [toc] 1. 网络中进程之间通信 我们深谙信息交流的价值，那网络中进程之间如何通信，如我们每天打开浏览器浏览网页时，浏览器的进程怎么与web服务器通信的？当你用QQ聊天时，QQ进程怎么与服务器或你好友所在的QQ进程通信？这些都得靠socket？那什么是socket？socket的类型有哪些？还有socket的基本函数 本地的进程间通信（IPC）有很多...