http://www.perlmonks.org?node_id=1212356


in reply to Splitting a large file into smaller files according to indexes

The first argument to open is a file handle or file handle reference. You provided $NEW, which is populated on the previous line by sprintf which returns a string. Did you mean
open $OUT, '>', $NEW or die ...
?

($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,