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,
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