Linux file management command instance analysis [permissions, create, delete, copy, move, search, etc.]

This paper gives an example of linux file management command. Share with you for your reference, the details are as follows:

1. File permissions

Read r 4

Write w 2

Run x 1

Files are divided into three types of permissions:

User permissions within the owner permissions group and outside the group

2. View the files in the directory

Ls [option] [path or file name]

-l: view details

-a: view all files, including hidden files

First column: file permissions

-(rw-) (-)

The first character indicates the file type (- for ordinary files, d for folders)

The second one represents owner permissions.

The third indicates the group permissions to which he belongs.

The fourth indicates the permission outside the group.

Second column: number of file nodes

Third column: file owner

Fourth column: the group to which the file belongs

Fifth column: file size

Column 6: the last modification time of the file

Seventh column: file name

3. Directory management

Mkdir directory name create directory

-p Recursive creation

-m specify permissions when creating directories (linux default permissions for creating directories are 755)

Rmdir directory name delete directories (only empty directories can be deleted)

-p Recursive deletion

4. File creation and deletion

Touch filename creation file

Rm filename Delete Files (will prompt for deletion)

-r Recursive deletion

-f indicates shutdown confirmation

5. Copy and move files

Cp [option] Source file path destination file path copy file

-R: recursive replication

-p: keep the original attributes of the file during replication

-v: displays the replication process

> cp-R / home/user1/123 / home/. (. Indicates the use of the original file name)

Mv [options] Source file path destination file path move file

-v: display proc

> mv / home/user1/123 / home/.

* mv can also be renamed.

6. Document statistics

Wc [options] File list Statistics File content

-c statistics on the number of characters

-l count the number of rows

-w count the number of words

> wc-c 1.txt > wc-w 1.txt

7. Search for matching lines

Grep [options] string source file

-n display line number

-c how many lines are matched

-I ignore case

> grep-ni hello 1.txt

I hope what is described in this article will be helpful to the maintenance of Linux system.