Linux View and modify file permissions

1. View: ls-l [filename]

2. Modifications

2-1. Writing method chmod [who] [+][-][=] [mode]

who note: U represents the owner of the file, G indicates the group to which the file belongs, o means others, and a means everyone

Compliance Description: + means add permission,-Indicates reduced permissions, = means overwrite original permissions

Mode Description: R for Read permission, W for write permission, x for executable permission

Example: chmod g+w temp.bak for adding write permissions to all groups for Temp.bak files

2-2. Digital Law

Numerical Description:-Indicates no permission, r corresponds to 4,w corresponding to 2,x corresponds to 1, memory; rwx corresponds to 421

Example: 765 corresponds to-rwxrw-r-x, the first-indicates that the file type is a file, independent of permissions, the latter three groups: 7 corresponds to rwx,6 corresponding rw-,5 corresponding r-x

Execute chmod 765 Temp.bak to change Temp.bak file permissions to-rwxrw-r-x

3. Supplement: The directory must have executable permissions to view or access the directory.

Linux View and modify file permissions