Keywords: sag

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## Logins from terminals

Logins from terminals (via serial lines) and the console (when not running X) are provided by the `getty` program. `init` starts a separate instance of `getty` for each terminal for which logins are to be allowed. `getty` reads the username and runs the `login` program, which reads the password. If the username and password are correct, `login` runs the shell. When the shell terminates, i.e., the user logs out, or when `login` terminated because the username and password didn't match, `init` notices this and starts a new instance of `getty` . The kernel has no notion of logins, this is all handled by the system programs.