testing for modules?

[Ed Hotchkiss]

i have a generic script that is using several modules on windows and linux
boxes. i need to have the scripts test if a module is installed, and then if
not - then to install the module. can anyone give me a headsup on how to
test for a module, returning something to indicate whether or not it is
installed, then after that executing file to install the module.? just
somewhere to start would be helpful! thanks in advance.

--
edward hotchkiss
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