Web Reference: When scripting with Pexpect what can happen is that Pexpect will respond to the “password:” prompt before SSH has had time to turn off TTY echo. In other words, Pexpect sends the password between steps 1. and 2., so the password gets echoed back to the TTY. I would call this an SSH bug. Dec 1, 2025 · This guide will demystify `pexpect` buffer mechanics, explain why unknown states occur, and provide actionable solutions to clear or flush the buffer, ensuring your scripts run reliably. Apr 12, 2015 · I am trying to clear any characters on the line after recovering from an unknown state, as in some cases they contain prompts and other keywords that I use in future expect method calls.
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