One of the Linux learning: viewing and modifying file permissions

1, the user's account information is all placed under the etc file.

2. File permissions

To view permissions for a folder: (Ls-ld folder name)

Column 2nd: Number of hard links to the table file (only available on Linux)

3rd Column: representing the owner

Column 4th: representing all families

5th column: Refers to the size of the file (LS-LH)

6th column: Displays the file creation time or the modified time

1th column:

The first character represents the type of a file

-: Representing ordinary files

D: Representative Directory

B: Device file (block device: U disk, optical drive, hard drive ...) ）

C: Device file (character file: mouse, keyboard ....) ）

L: Soft Connect (shortcut)

2nd---The >9 character represents the permissions of the file, divided into 3, 31 groups

USR Group Other (R Read, w write, x executable)

3, modify the permissions of the file-------chmod command

R------> 4

W------> 2

x------> 1

　　-R------> Recursively modify permissions for files and folders inside folders

Modify permissions for CDROM---------------> Practice yourself?

4, change the owner of the file, all families. -------------->chown Command/chgrp command (the latter changes all families individually, the former can change the owner and all families)

(1), can change one at a time, can also change two at a time, when the owner and all families change, the middle with ":" or "." Separate.

Change permissions for all families individually: chgrp

　　　　　　　　　　

5, under the Linux system, the file extension does not matter, and the suffix is not related (except for the specific file). ------------->file

File

One of the Linux learning: viewing and modifying file permissions