Query user C<PROMPT> and return answer from user.
Honours GIT_ASKPASS and SSH_ASKPASS environment variables for querying
-the user. If no *_ASKPASS variable is set or an error occoured,
+the user. If no *_ASKPASS variable is set or an error occurred,
the terminal is tried as a fallback.
If C<ISPASSWORD> is set and true, the terminal disables echo.