How do I know if I'm in the /bin/sh environment?

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Autor: MarkBerkwittmberkwitt@home.com
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Asunto: How do I know if I'm in the /bin/sh environment?
The installation instructions for Corel WordPerfect state:
    The Runme script must operate in the /bin/sh environment.


How do I know what environment I'm in?

thanks,
Mark