Linux file structure and user group concepts.

Reference: http://www.cnblogs.com/xiaoluo501395377/archive/2013/04/01/2992642.html

The file structure is a single-tree structure. There is only one root directory. different from the win system . Specific references articles

file Attributes control permissions: R Read permission, W writable permission, x executable permission. Each permission is represented by a number: r==4 (+), w==2 (010), X==1 (001)

Example:-rwxrw-r--1 501 502 Test.java

[-] [RWX] [rw-] [r--] divided into four segments

The first paragraph represents the file type:-file, D folder, L link

The permission of the second paragraph owner.

Group permissions for the third segment owner.

The fourth paragraph outside the group permission.

Note: Thereis no limit to root privileges .

1 501 502 Test.java each field means:

1: Number of files represented. The file is 1, and the folder is the number of child files.

501: User ID (Uniqueness)

502: Group ID of the user (uniqueness)

100: Storage size

Mar: Creation Time

Test.java: File name

Commands for file operations: reference http://www.cnblogs.com/zheng39562/p/4167075.html

Linux file structure and user group concepts.