Linux Rights Management

Three basic permissions

R Read permission (read)

W Write permission (write)

X Execute permission (execute)

1th bit: File type (d directory,-normal file, L link file)

第2-4位: The owning user right, denoted by U (user)

第5-7位: The owning group permission, expressed in G (Group)

第8-10位: Other user rights, denoted by O (other)

第2-10位: Represents all permissions, denoted by a (all)

Full information: A file that the owning user has read and write execution permissions;

have read and Write permission, no execute permission, other user only Read permission

Change operation permissions

chmod Modify File Permissions command (change mode)

Parameter:-r file and subdirectory do the same permissions operation (recursive recursive)

Example: chmod u+x a.txt

? Use numbers to represent permissions (r=4,w=2,x=1,-=0)

Example: chmod b.txt

RWX with binary notation is 111, decimal 4+2+1=7

R-x with binary notation is 101, decimal 4+0+1=5

Linux Rights Management