$ perl -wE 'say for ()[2, 1, 0]' $ perl -wE 'say for ("a")[2, 1, 0]' Use of uninitialized value in say at -e line 1. Use of uninitialized value in say at -e line 1. a #### $_ = sprintf '%04d-%02d-%02d', ((split m:/:), (0) x 3)[ 2, 0, 1 ] for @fields[ 10, 14, 24, 26 ]; #### ($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,