[Bird Brother Linux Video tutorial finishing]01_04_linux operating system basics

First, the Linux Basic principles:

1. Composed of a single small program, the combination of small procedures to complete complex tasks;

2. All documents;

3. Try to avoid capturing the user interface;

4. The configuration file is saved in plain text format;

Second, about the interface:

1.Linux has two interface forms, namely GUI interface (graphical interface) and CLI (command line interface), use command prompt (prompt) in CLI interface for user to enter command, use Bash (shell) to show to user, at command prompt, just enter command, The command is sent to the kernel by the shell, which determines whether the program has execute permissions and whether it can execute, and also where to start execution.

2. There are two users at the command prompt, the root user (#:) and the average user ($:).

Third, the command format:

Command option Parameters

Option "Short option:-Multiple options can be combined, such as: Ls-ah; Long options:--, cannot be combined"

Function object of the parameter "command"

Iv. Use of vouchers:

The default root password is strictly case sensitive

Five, virtual Terminal: Terminal

1. Can use the combination key CTRL+ALT+F1-F6 to switch;

2. Start the graphical interface: Use the ALT+F7 key combination or enter at the command prompt: StartX & to switch.

Vi. GUI (graphical interface):

Gnome: Developing with C language

KDE: Developing with the C + + language

XFace: A compact, lightweight operating system for embedded platforms

Vii. CLI (Command line interface):

Bash, CSH, zsh, Ksh, tcsh

Eight, user switch: SU (switch User)

1. Full Switchover: su-l

2. Return: Exit

Nine, Password: passwd Modify the current user password

The administrator randomly changes to another password, ordinary user change password The general default policy should conform to the password complexity rules. As follows:

1. Use at least 3 types of 4 characters (numeric, uppercase, lowercase letters, special characters);

2. Long enough, greater than 7 bits;

3. Use random strings;

4. Regular replacement;

5. The cycle period is large enough.

This article is from the "Linux Blind Advanced Road" blog, please be sure to keep this source http://blindbird.blog.51cto.com/12338383/1878156

[Bird Brother Linux Video tutorial finishing]01_04_linux operating system basics