How to check from a shell script that a particular software is installed

Hai friends
I want to write a shell script which has to check whether a particular software is installed on the machine, or not. If installed, then what version is it using and the get the version number and which type of installer is it? i mean is it a .rpm installation or a tar.gz installation.
how can i check this from a shell script. If any of you have any idea please give me a sample script to check this
Thank you

@Raja_Abilash
I don't think this is a right thread & right forum to POST this question.
better go ahead with forums related to LINUX.

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KORONT_041_SH module: KORONT - Daily Item Master Update
+---------------------------------------------------------------------------+
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