What happens when the Linux password cannot be entered?

What happens if the Linux password cannot be entered?

Enter the password in the terminal. You will not see asterisks or dots when entering the password. It won't have any visual indication of entering a password, there won't be any cursor movement, nothing will be displayed.

In fact, it is entered, but the clear text is not displayed.

After completing the input, just hit Enter.

Extended information:

The validity period of the Linux user password and whether the password can be modified can be controlled through the login.defs file. Modification of the login.defs file only affects For subsequently created users, if you want to change the validity period of previously created users, you can use the chage command.

The complexity of Linux user passwords can be controlled through the pam pam_cracklib module or pam_passwdqc module. Both cannot be used at the same time. Personal feeling pam_passwdqc is better to use.

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