Linux command System (i)

One: commands for displaying directories and systems

The 1:is command is used to display information about the specified directory and file

Permissions: All Users

-A lists all files under the directory

-B The characters that are not output in the file are numbered with backslashes and characters

-C Output File I-node modification time, and sorted by this

-D Displays the directory like a file without displaying the following folder

-l list File details

-P or-F appends a character to each file to indicate the file type and cannot be shared with the L parameter

-r Display fixed directory and sub-directory content

file type: the

-Denotes normal file

D indicates directory

L represents a symbolic link file

P indicates pipeline file

file Permissions

R Read-only

W Writable

X executable

T-paste

2:dir command: Used to display relevant information under a specified directory or file

Permissions: All Users

-p equivalent to the-p parameter in is

-r displays content in directories and subdirectories

-a displays all files in the specified directory, including hidden files

Modify directory file permissions and commands for the master and owner groups

1:chmod: Permission to change the owner, group, and other groups of a specified directory or file

Permissions: Root user or other user and group with permissions

U represents the owner of the file

G means that the owner of the file belongs to the same group

O means other than the other person

A means the above three

+ indicates increased permissions

-Represents the Cancel permission

= indicates a unique set of permissions

R indicates readable

W indicates writable

X indicates an executable

X means only if the file is a subdirectory or the file has been set as executable

-C Show Change action if file permissions have changed

-F does not display an error message even if the file cannot be changed

-V Show details of no permission changes

-R changes the same permissions for all files in the current directory and subdirectories in a recursive manner

2:chown command: Used to change the owner of the specified file, the genus Group

Permissions: Root or other privileged users and groups

-C If this file has changed, the change action is displayed

-F If the owner of the file cannot change or display an error message

-H only changes the link, not the file that link really points to

-V Show details of owner changes

-R the same owner changes to all files in the current directory as subdirectories, recursively changing them in a recursive way

3:CHGRP command

Used to change ownership of a file or directory

Permissions: All Users

Example: Change the owner of an AA file to Jack

CHGRP Jack AA

4:chattr command: For setting files with permissions that cannot be deleted or modified

Permissions: Root

I immutable, the file that set the I attribute cannot be modified, the user can neither delete it nor rename it, or other action: Only a super administrator can eliminate this property

Example: Setting the A.txt file is not modifiable

, Chattr +i a.txt

5:lsattr used to tie the hidden properties of a file or directory

-D Show hidden properties of a directory

-R recursive display of hidden properties of files in directories and subdirectories

-A displays the properties of all files and directories in the current or specified directory

-V Displays the version of the program

Example: Show hidden properties of all files in root directory

Lsattr-a

Displays the properties of all files and subdirectories under the FTP directory

Lsattr-ra/ftp

commands for creating and deleting directories

1:mkdir command: Used to create a directory

Permissions: All Users

-p Ensure that the directory name exists and that it does not exist to create a

-m set directory permissions when creating a directory

2:rmdir command: Used to delete empty commands

Permissions: All Users

-p When subdirectories are deleted this directory is also empty directory and deleted

commands for creating and deleting files

1;touch command: Change the file's time record and create a new file

Usage rights: All users

-D set time and date, can be used in a variety of different formats

Example: Create AA, BB, cc three files under a file

Touch {AA,BB,CC}

Modify Time History

touch-d "05:07pm 05/11/2010" AA

2:RM command: Delete a file or directory

Permissions: All Users

-F Force Delete files or directories, delete files or directories money no longer asks users

-I asks the user before deleting both files or directories, the default

-r/-r recursive processing, processing the files under the specified directory and subdirectories

3:MV Renaming and Moving commands

Permissions: All Users

-B If you need to overwrite files, back up before moving

-F Overwrite existing files and directories directly if the destination file or directory is duplicated with an existing file or directory

-I ask user before overwriting

-U does not overwrite if the destination file already exists and its file date is newer than the source file when you move or change the file name

-V Show Details when executing

6: Copy command: CP Copy file or directory

-L link to source file instead of copy

7:SCP commands the user to copy a local file or directory to a remote server, or to copy files from a remote server to a local

-P remains the same as the source file properties

-P Enter the custom port number

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Linux command System (i)