Script writing for a password prompt

I writing a shell script to import a password on a password prompt.. How can I enter a password on a password prompt without typing the words in...For example if I do su -help the password prompt shows up. How can I import the password automatically into the script which then writes in when the password prompt shows up...Here's a example of my script or would I need to write this C

start="su -help"
export start

           echo "Starting the user help"
           $start echo
           ????????????(password prompt)
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stty -echo
read passwd?"passwd: "
stty echo

But be careful. If you pass $passwd to on the command line then it will be viewable with the ps command. You need to pass it on stdin or in a file. There is also a whole other can of worms related to what you're using to check that the password is correct, how the password database is stored, how to force using good passwords, etc., etc.
> How can I enter a password on a password prompt without typing the words in. ..
depends on which application you want to send the password
most proper UNIX programs do not allow to get the password from anything else than the tty to script for tty you need something like

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