perl -E 'say log(~0)/log(2)'

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update:

Note that this command shows the number of bits on an IV, the type used internally by Perl to handle integers. Usually, it has the same number of bits as the CPU architecture but it is also possible to compile Perl for a 32 bits architecture while having 64 bits IVs. For instance, Debian does it.

In reply to Re: How to tell 32 or 64 bit by salva
in thread How to tell 32 or 64 bit by esr

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