Linux Fundamentals 3

Basic principles of Linux:

1, the file is relatively small, single function, a large system needs to combine a number of small programs.

2, all documents.

3, plain text configuration.

CLI Interface: command-line interface. Provided by the shell, the common shells are bash, csh, Ksh, zsh, tcsh

(bash) command prompt: 1, #:----root

2, $:----user

Format of command: Command option parameter

Options: Fixed the function of the command, you can see all the options in the command.

1, short options-

Multiple short options can be combined, such as:-a-b ===>-ab

2, long Options--

such as:--ABC

Parameters: The object of the command, which is arbitrarily specified by the user of the command, cannot list all parameters.

Terminal: Terminal

Switch to Cli:ctrl+alt+f1~f6

Switch to Gui:ctrl+alt+f7

Categories of GUI:

1. GnoME

2. KDE

3, XFace: Lightweight

Rules for complexity of passwords:

1. Use at least three of the numbers, capitals, lowercase letters, and symbols four characters.

2. At least 7 people

3. Use random characters

4. Regular replacement

5, the cycle period is greater than 24 months

Library file Lib:

DLL files in Windows

So files in Linux

AAA Certification:

1. Authentication mechanism: Authentication

2. Authorization: Authorization

3. Audit: Audition

Magic Numbers: The magic number is placed on the head of the file to indicate the type of file.

Directory: A special kind of file, path mapping.

Linux Fundamentals 3