Passing input into passwd using pipe

Question

How can I pipe some input using echo, into program that requires user typing something two times?

for example

echo "somepassword"|passwd someuser

creates this error message

Enter new UNIX password: Retype new UNIX password: passwd: Authentication token manipulation error
passwd: password unchanged

because I didn't retyped password

Solution

You need to send the password twice:

(echo 'somepassword'; echo 'somepassword') | passwd someuser