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:param str orig_prompt: The prompt to expect at first.
:param str prompt_change: A command to change the prompt to something more
unique. If this is ``None``, the prompt will not be changed. This will
be formatted with the new and continuation prompts as positional
parameters, so you can use ``{}`` style formatting to insert them into
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:param str new_prompt: The more unique prompt to expect after the change.
:param str extra_init_cmd: Commands to do extra initialisation, such as
disabling pagers.
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