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add a bit of detail on how WPKG uses check conditions at beginning of article
Of course it would be unwise to launch the installer if the software is already installed. That's why there are "check conditions".
The check conditions are also used after the installer has finished to verify that the software has actually been successfully installed.
If no check statements exist in the package, WPKG will just run the install commands and (as long as no error occurs) will add/update the package details in the local client database.
Check conditions are broken down into 4 categories: