bash - How can I programmatically verify if a CYGWIN app is installed in a SH script? -

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Here's the situation:

I am writing a sh deployment script which is the command install in an RSYNC signboard. After this, I want to send an e-mail to the development team that it has been deployed with some details. I will use "EXIM" to send mail from CYGWIN.

This is the thing that, EXIM is optional only when installing CIGVIN and if I can not install it then I would like to skip my SH script.

Thank you in advance! 

  # bash script (should also work with sh) echo "this is not Is "

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