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You can find out in other ways.

If you're only using 64bit software, there is no reason to have 32bit software installed. But if you don't know what your system is doing, and software has been installed by others, you may indeed not know.

If you want to find out and it is operational, you could check with lsof and monitor open files using a systemtap script or using the auditing framework. Have it running for some time that is indicative of all functionality (including cron-jobs etc...) and then inspect the list of files/libraries that were used.

It should also not be that hard to automate so that it finds 32bit applications/libraries on your system. The end result would be that you have either an OK that the system can become 64bit pure, or that a certain set of files on your system require 32bit binaries.

I have done the above on systems where I knew from the start they were intended to be 64bit pure because I only use RPM packages and everything was available in 64bit.

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