What is the purpose of the shadow file in Linux?

The shadow file in Linux is used to store encrypted passwords of users. In a Linux system, passwords are stored in the shadow file encrypted, rather than in the passwd file. By storing passwords in the shadow file, it enhances password security and prevents unauthorized access to password information.

The permissions of the shadow file are set so that only the root user can read and write it, preventing regular users from accessing it directly and obtaining password information.

In addition to storing password information, the shadow file also contains other information related to user passwords, such as expiration time and account lock status.

In conclusion, the purpose of the shadow file is to enhance the security of user passwords and increase system security.