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Access Control List (ACL) is a more flexible and fine-grained permission management mechanism, used to define and control the access permissions of file system objects. Compared to traditional file permission systems, ACL provides more detailed permission cont...

Composition Structure -rwxr-xr-- The first character indicates the file type: -：File, such as text files, binary files, etc. d：Directory. l：Symbolic link, Symbolic link (Soft link). b：Block device, such as hard disk, CD-ROM, etc. c：Character device, such as...

Relationship Primary Group When a user is created, a group with the same name is also created, which is the primary group. grep soda /etc/passwd soda:x:1001:1001:,,,:/home/soda:/bin/bash The fourth field indicates the primary group ID 1001, which can also b...

Account /etc/passwd Linux uses the /etc/passwd file to store user account information. Because many service processes need to read user account information, you can see that the file's permissions are all readable. -rw-r--r-- 1 root root 2010 Aug 24 15:12 /et...