How does Linux modify a user's password through a script? Scripting Automation modifies user passwords?

Requirements Description :

Linux environment in the creation of users, involves the modification of the user's password, generally through the passwd command to modify, need to confirm multiple times, here consider a command directly to modify the password

There is no way to interact. This record.

Operation Process :

1. Use the echo command to combine the passwd command to achieve

Echo " mytest " passwd --  for user mytest. passwd: All authentication tokens updated successfully.

Note: The part marked in red is the password. passwd using the--stdin option means telling the passwd command to read the new password from the standard input. Reads the standard input from the previous pipe .

2. Verify that the password is successfully modified by toggling

su - mytest    # switching from root to normal user does not require a password   su - mytest  # to switch users again , you need to enter a password  ~]$              # password is correct, you can perform a normal switchover

Note: You can already successfully log in using a password that you previously set.

passwd's--stdin is explained as follows :

--stdin This              option was used to indicate that passwd should read the new password from standard input, which can be a Pipe.

Document creation time: July 2, 2018 13:14:12

How does Linux modify a user's password through a script? Scripting Automation modifies user passwords?