[linux] How to pass the password to su/sudo/ssh without overriding the TTY?

Set SSH up for Public Key Authentication, with no pasphrase on the Key. Loads of guides on the net. You won't need a password to login then. You can then limit connections for a key based on client hostname. Provides reasonable security and is great for automated logins.

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How to run script as another user without password? How do I use su to execute the rest of the bash script as that user? How to pass the password to su/sudo/ssh without overriding the TTY?