in reply to New to me: What does $var = -s 'file' do?

perldoc -f -x

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returns among other:

-s File has nonzero size (returns size in bytes).

= is the normal old assignment operator.

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In Section Seekers of Perl Wisdom