Shell Programming and Scripting

Is there a way to change user password using passwd command in shell script?
I don't want to use expect.


Please help

use the command passwd, it will ask for old password and then the new password twice

I want to use it in a script without my interaction. I want to provide new password in a script a than run passwd to change user password.

Problem of using passwd in shell script is that passwd requires user interaction to change password and script stops. My question was is there a way to use passwd without interaction or is there other way to change password using shell script

To do what you want you would need to embed your password in a script in plain text - not good for security! Do you really want to do this?

Yes I want

From my man page on passwd... . Yours might not accept input from a script, depending on the system.

Code:

PASSWD(1)                       User utilities                       PASSWD(1)

NAME
       passwd - update a user's authentication tokens(s)
...
       --stdin
              This  option  is  used  to indicate that passwd should read the new password
              from standard input, which can be a pipe.

You could embed only the encrypted portion of the password and use sed to update /etc/shadow.

nathan - the "--stdin" option is not universial.