chpasswd

Change the passwords for multiple users by using stdin. More information: https://manned.org/chpasswd.8.

• Change the password for a specific user:

printf "username:new_password" | sudo chpasswd

• Change the passwords for multiple users (The input text must not contain any spaces.):

printf "username_1:new_password_1\nusername_2:new_password_2" | sudo chpasswd

• Change the password for a specific user, and specify it in encrypted form:

printf "username:new_encrypted_password" | sudo chpasswd --encrypted

• Change the password for a specific user, and use a specific encryption for the stored password:

printf "username:new_password" | sudo chpasswd --crypt-method NONE|DES|MD5|SHA256|SHA512