如何在脚本中使用密码从shell脚本登录用户帐户？

Question

I am writing a shell script to login to any user account with the password mentioned in the shell script itself. My shell Script is as follows:

mypass="helloworld"
echo mypass>su myaccount

After executing this shell script i am still in my current user account rather than in myaccount

TL;DR I want to know how to login to a user account via a shell script by just running it.

Answer 1

Sending password through script is possible by using expect script, Below is the very basic expect script for login to su account and executing pwd command.

#!/usr/bin/expect

spawn su myaccount          # Spawning the su process
expect "Password:*"         # Wait/expect for the Password string from the spawned process
send "uraccpassword\r"      # send the password to spawned process as an input.
expect "*bash*"
send "pwd\r"
expect "*bash*"

Answer 2

If you want to login to an account without providing a password then you'll need to generate ssh keys from your account using ssh-keygen and copy the public key into the account you want to login to. Additionally, I would always set a passphrase on the generated keys and use ssh-agent to manage it.