Linux/centos Basic Operation

Source: Internet
Author: User

Tags: perform media boot usermod temporary file Auto Hide Run program filter

File directory

    1. USR: related to software Installation
    2. VAR: system Run Process related
    3. Bin: Executable file
    4. Boot: System Boot related directory
    5. Dev: Drive Directory
    6. Home: Store user's individual user files
    7. Lib:linux function Library
    8. Media: can delete devices
    9. MNT: Media-like
    10. OPT: third-party software storage Directory
    11. Root: Administrator Directory
    12. Sbin: Administrator executable file
    13. Temp: Temporary files that need to be deleted periodically
    14. Proc: Virtual File system
    15. SYS: Virtual file system, kernel module
    16. ETC: Store the user group file "group", User information file ' passwd

Common commands

  1. View Ip:ip Addr
  2. View information ls
  3. View more information ll or ls-l
  4. View hidden files Ls-al
  5. Create a folder (you can fill in the path, but the path must exist) mkdir <name>
  6. Create file (path does not exist, create path automatically) Mkdir-p <name>
  7. Safe deletion (only empty directories can be deleted or error) RmDir <name>
  8. Delete Rm-rf <name>
  9. Create File VI <name>
  10. Save File Press ESC, enter: q/exit or wq/Save and exit
  11. Edit press I--press ESC--q!/force quit or wq/save and exit
  12. The arrow keys in the file h/left, k/, j/, l/right
  13. Fast Move cursor number key + arrow key
  14. Page DOWN Ctrl+f
  15. Page UP Ctrl+b
  16. Turn up half a page ctrl+u
  17. Turn down half a page ctrl+d
  18. Move to end of line end or $
  19. Move to the wardrobe home or 0
  20. Move to the end of Wen Shift+g
  21. Move to the beginning G+g
  22. How many rows of numbers to move backwards +shift+g
  23. Querying the command line/+ query criteria
  24. Query up the command line? + Query criteria
  25. Delete Files Rm-f <name>
  26. 10 lines after viewing the file tail <name>
  27. 20 lines after viewing the file tail-20 <name>
  28. Float, change the contents of the file, print out the changes tail-f <name>
  29. Print file contents Cat <name>
  30. filtering, finding grep <name>
    ll |grep ‘txt‘ 文件夹下的txt格式文件

User actions

    1. User must belong to a user group, you add a user, the system will automatically help you create a user group
    2. Add user Information Useradd <name>
    3. Print user Information cat/etc/passwd

Printed information cc:x: 1000:1000::/home/cc:/bin/bash

Directory for user name, password, user ID, user group ID, notes, user directory, Shell command, respectively

4. Add a password to the user passwd <name>

5. Remotely connect a computer SSH < user name >@ address

6. View user Groups Cat/etc/group

7. Create user group Groupadd < user group name >

8. Add user to User group Useradd-g < user group > < user name >

9. Delete user groups Groupdel < user groups >

However, the user primary group cannot be deleted, the user primary group is a user group with the same name as the user name, you can change

10. Delete User Userdel < user name >

11. See which user group the user belongs to, group < user name >

Direct write group, is to view the current user group

12. Modify user Primary group Usermod-g < user group > < user name >

13. View the user's details ID < user name >

14. Switch User Su < username >

15. Exit the user exit

Background operation

    1. View Machine Type Lscpu
    2. View disk full space DF
    3. View disk space df-h
    4. View index Space Df-i
    5. View current running program PS aux
    6. To see if the program is running PS aux |grep < user name >
    7. View top of a computer's resource footprint
    8. Exit Ctrl C
    9. If you cannot connect to the server, you need to turn off the firewall

Systemctl Disable FIREWALLD


All interfaces on Linux are in the form of files

Linux/centos Basic Operation

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