Linux file permissions--file System file and folder Rights Management standards detailed __linux

You see these words when you use the command Ls-la under Linux, and these words are expressed as permissions for different groups of users:-r-xr-x--x

1 File Operation rights

R:read is read permission--the number 4 means
w:write is write permission--the number 2 means
X:excute is the execution permission--the number 1 indicates

2) User Rights

There will be a total of 10 characters,

The 1th represents the file type, as if the file is-represents a file, (d: folder, L: Connection file)

The 2nd to 10th represents user rights, three groups

The previous three represents owner permissions, the middle three represents the same group of user rights, the last group represents other user rights, and other users do not include root, the super user

Like what:

-XRWXRW---  represents the contents of the file, 770 permissions, with and the same group of users have read and write permissions, other user groups do not have any permissions

-r-xr-x--x    means that the content is a file, the permission is 661, is the owner and the same group of users can read, execute, other users can only perform