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Something like this? I faked an input file because you did not include a valid input file.

#!/usr/bin/perl use strict; # https://perlmonks.org/?node_id=11132513 use warnings; my %hash; while( <DATA> ) { my ( $top, @rest ) = split /,|\n/; # FIXME faking CSV for testing $hash{$top} = chain(@rest); } use Data::Dump 'dd'; dd \%hash; sub chain { return @_ > 1 ? { shift() => chain(@_) } : shift(); } __DATA__ a,b,c,d,e f,g,h,i,j xx,yy,zz this,is,a,strange,type,of,data,organization

Outputs:

{ a => { b => { c => { d => "e" } } }, f => { g => { h => { i => "j" } } }, this => { is => { a => { strange => { type => { of => { data => "organizatio +n" } } } }, }, }, xx => { yy => "zz" }, }

In reply to Re: Creating a Multi Level Hash from CSV by tybalt89
in thread Creating a Multi Level Hash from CSV by workInProgress12

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