NOTES: Linux--First knowledge shell

One: Word accumulation

Current: currently

Directory: Directories

Entries: Articles

Default: Defaults

Information: Information

Format: Formatting

Ignore: Neglect

Licensing: Licensing

Two:

1.GNU Bash Description: The shell is the user interface of the Linux system, it receives the user input commands and then sends it into the kernel to execute, it is actually a command interpreter, it explains the user input commands and sends them into the kernel (equivalent to a handset),

Bash is a kind of shell.

2. Feature Brief: File management

User Management

Rights Management

Disk Management

Software Management

Network management

3.bash Shell prompt:

For example "[email protected]/" #

Root: Currently logged in User name

Tianyun: Host Name

/: Directory in which you are currently located

**********************

Examples of SMALL commands:

Date: Query the current system time

WHOAMI: Querying user identities

Useradd User name: Create a normal user

passwd User name: Set a password for the normal user you create

4.shell syntax

Command option Parameters

Command: The body of the entire shell command

Options: Used to decorate commands, usually identified by-,--

Parameters: The object to which the command works

5.bash Basic Features

1. Auto-complete command: Shift key

2. Shortcut keys:

CTRL +

C: Terminate the currently running program

D: Exit, equivalent to exit

L: Clear screen (actually turned over a page)

A: Move the cursor to the front of the command line

E: Move the cursor to the back end of the command line

U: Remove all characters before the cursor

K: Remove all characters after the cursor

R: Search history command, using keywords

ALT +.  esc+. !$: Referencing the last parameter of the previous command

3. Historical command:

A: Cursor up and down keys

B:ctrl+r Search History command (input keyword)

C:! 220 (No. 220 command of the execution History command, if you use the historical command)

D:! The most recent command in the string Search History command that starts with the XXXX character

4. Command aliases: You can give a command a name, easy to use

Example: Alisa tianyun= ' Date '

Then when the input is Tianyun and the execution result of input date is consistent

5. Help command:

1.ls--help

2.man ls

3. Official manuals, etc.

NOTES: Linux--First knowledge shell