Password files for Linux user-related files

1. File Address:
/etc/shadow
----------. 1 root root 842 October 6 13:09/etc/shadow
2. Contents of the file:
Xiaol_1:$6$ndcank3y$ypnzihlxfkrohbzd:17080:0:99999:7:::
3. Information meaning:
1th field: Name of the user
2nd field: Encrypt password
Encryption algorithm for SHA512 algorithm
If the password bit is "!!" or "*" means you cannot log in
3rd field: Password Last modified date
Use January 1, 1970 as standard Time, every day time stamp plus 1
4th field: Two times password change interval
Compared to the 3rd field
5th field: Password expiration
Compared to the 3rd field
6th field: Number of warning days before password modification expires
Compared to the 5th field
7th field: Days of grace after password expiration
Compared to the 5th field
-1 Password Never expires
0 expire immediately after password expires
8th field: Account Expiration time
Time stamp representation
9th field: Reserved
4. Time Stamp conversion:
Date-d "1970-01-01 17080 Days"

Password files for Linux user-related files