Level user switching failed

Problem: The switching of the level user fails, but it can be switched through root

Reason: The level switching user needs to obtain the switching user password, because the previously set user's password is wrong, causing the switching failure

Reasons for incorrect password setting: When using echo and keyboard input, forget the password behind echo and forget the double quotes, resulting in a password you do n’t know;

The user switching through root does not require a low-privilege password, so the switch is successful

Incorrect naming: echo redhat | grep passwd user1

Correct command: echo "redhat" | grep passwd user1 

The following is a screenshot of failed user switching

 

The password is set successfully, and the user is switched successfully.