Permissions define
linux file permissions into: r read permission (4), w write permission (2), x execute permission (1)
linux rights objects are divided into: owner, group of users, other users
Permission to modify:
chown user: group / usr / local / xxx: the directory or file / user / local / xxx group assigned to the owner of the user (user) (group) of
chown -R user: group / usr / local / xxx: -R represents recursively, all files and folders under that directory are authorized to do the same operation
chmod 777 / uss / local / xxx: the owner, the group and other users have read, write, and execute permissions (3 7 objects are the owner, the group users, other users)
chmod 775 / usr / local / xxx: the owner and the group users have read, write, and execute permissions, other users have read and execute permissions
chmod + x /etc/init.d/xxx: All users execute permission (along + w, + r)
chmod -x /etc/init.d/xxx: remove execute permission for all users (the same also -w, -r)
Permission to view:
Run ll
The first column: drwxr-xr-x indicates that the user execute permission to read and write, composed of four parts: d, rwx, rx, rx. D represents a first portion of the folder, as well as the same: l represents connection, - represents a file. The second part owner rwx represented by the executive authority to read and write; the third of four parts rx represent the group and other users have read-execute permissions to other users, no write permissions.
The third column: testuser represents a file owner
The fourth column: testgroup indicates that the file owner's group