a,b,c,d
e,f,g,h
i,j,k,l
@arr1 before the chomp should like like above when printed out.
Why would you expect that?
>perl -wMstrict -le
"my $s = qq{a,b,c,d\ne,f,g,h\ni,j,k,l};
printf qq{$s};
printf qq{\n};
;;
my @ra = split /\n/, $s;
printf qq{@ra};
printf qq{\n};
;;
chomp @ra;
printf qq{@ra};
printf qq{\n};
"
a,b,c,d
e,f,g,h
i,j,k,l
a,b,c,d e,f,g,h i,j,k,l
a,b,c,d e,f,g,h i,j,k,l
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