1, directly view the permissions of the file or folder command: >>ll or >>ls-l R for Read permissions, W Write permission, x for Execute permissions The first representative file type,-the representative is a normal file, d means that the folder permissions are divided into 3 groups, 3 a group, respectively, is the owner, belongs to the group, others
2, modify the file permissions: Rights Management command chmod, full spell: Chang permissions mode of a file syntax: chmod [{ugoa}{+-=}{rwx}][file or directory] & nbsp [mode=421][files or directories]  -R Recursive modification U: Owner, G: Owning group, O: Other person, a: all; +: Add permissions,-reduce permissions, = Direct assignment to this permission 3, for example, add execute permission to the owner chmod u+x file name 4, you can set multiple permissions directly, for example: chmod u+x,g+w The file name 5, describes the second more common display of the number of permissions, 777,755, which respectively represents what the permission number represents: R-------------4w------------2x-------------1rwxrw-r-- 7 6 43 groups, rwx permissions corresponding to 421 add 7,rw-corresponding 42 Add the 6,r--corresponding to 4 (drwxrw-r--here the first character d for the folder;-rwxrw-r-- Here the first character-represents a normal file) 6, So let's see what the above 755 represents. 7 corresponds to 4+2+1 rwx5 corresponding 4+1 R-x then the permission of this file is the owner rwx, group R-x, others r-x when we change the permissions generally first think about what to change, Then correspond to the number of direct settings such as we want to change rw-r------corresponding number 640 We still modify just the file 7, for example, select-R to directly recursively modify the folder LXF the permissions of all files within the folder file permissions to modify the following: Modify the permissions of all files in the LXF folder as follows : Delete folder: RM-RF + directory name such as delete/data/mysql directory and files, folders under it:rm-rf/data/mysql delete files: For example, delete/data/log/eRror.log This file rm-rf/data/log/error.log Note: Linux does not have a recycle Bin, you must be careful when using RM-RF This article refer to address: https://jingyan.baidu.com/ article/4853e1e5413b541909f72632.html
Permissions to view and modify folders and files under the Linux system, and the use of File and folder deletion RM-RF commands
