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This article mainly introduces the linux system command note example analysis, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

What is Linux system Linux is a free-to-use and free-spread UNIX-like operating system, is a POSIX-based multi-user, multi-task, multi-threaded and multi-CPU operating system, using Linux can run major Unix tools, applications and network protocols.

This article describes linux system commands. Share with you for your reference, the details are as follows:

I. linux system directory

/ bin system command directory

/ dev device directory

/ home every system user has a directory under home

Each user will automatically log in to this directory after logging in to the system.

Root users will be under the / root folder.

/ lib system library directory

/ media multimedia directory

/ mnt mount directory

/ proc system memory directory

/ sbin superuser system command directory

/ tmp system temporary files

/ var the directory of files that change frequently (e.g. database, log)

/ boot system startup file directory

/ etc configuration file directory

/ lost+found lost and found

/ opt directory where the third-party application is located

/ root superuser directory

/ usr system application directory

Second, commonly used shell

1. What is shell?

Shell is the command set.

2.linux command syntax

Prompt > Command name-option argument

3. Common command

Ls views all the files in the directory

-l view file details

-a View all files, including hidden files

Pwd View current work path

Cd switch work path

Clear screen cleaning

Logout logout

Shutdown shutdown

-h minutes. How long will it take to turn off the phone?

-r minutes to restart

-k warning

-c cancel shutdown

Halt, turn it off immediately.

Reboot restarts immediately

* ctrl+alt+F (1-6) to character interface, ctrl+alt+F7 to graphical interface.

III. VI Editor

1. What is VI?

Visual interface visual interface

2. Vi operation mode

1) Command mode

After opening the file, it is in command mode by default, and the file cannot be edited in command mode.

2) input mode

Press I in command mode to enter input mode, which is easy to edit the contents of the file.

3) Last row mode

When you have finished editing, press the ESC key to enter command mode, and then press: enter last line mode

3. Vi command syntax

1) if the vi filename edits the file, it will be created if it does not exist.

2) vi + filename opens the file and locates the last line with the cursor.

3) vi + n filename open the file and position the cursor on line N.

4) vi + / string filename open the file, look for keywords highlighted, press n to jump.

5) vi filename filename edits multiple files to enter the next file: n, enter the previous file: prev

4. Vi shortcut key

I enter the content in front of the cursor and enter input mode

An enter the content after the cursor

Esc enters command mode

Yy copies a row

Dd deletes a row

P paste

: enter the last line mode

The numeric cursor is positioned to the specified line

W save

Q exit

: X save and exit

: set nu displays the line number

: set nonu cancels line number

: w! Or Q! Force save or force exit

/ keywords find keywords, highlight

5. Install vi software

Rpm: software installation, uninstallation, upgrade and query

-Q query

-an all software packages

-e Delete

-I installation

-v shows progress

-h is shown by the # sign

1) query whether to install vi software

Rpm-qa | grep vi

2) if installed, delete

Rpm-e package name

3) Mount the second CD

Eject eject CD-ROM drive

Mount-t auto / dev/cdrom / mnt/cdrom

Mount cdrom to cdrom under mnt, and if prompted that cdrom does not exist, then mkdir / mnt/cdrom

So you can access the contents of the CD under / mnt/cdrom.

Umount / mnt/cdrom

Unmount cdrom

4) locate the installation package rpm and install

Rpm-I installation package

4. A single user cracked the password

1) when entering the system for reading seconds, press any key to enter the following interface, and then press e.

2) then select the following options and press e to enter the interface below.

3) add a space and single at the end, enter and press b to start.

4) after entering the system, use passwd to change the password

5) finally, restart by reboot

Thank you for reading this article carefully. I hope the article "sample Analysis of linux system Command Notes" shared by the editor will be helpful to you. At the same time, I also hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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