You don't need that grep stuff 

 
#!/usr/bin/perl --
use strict;
use warnings;
use File::Find::Rule qw/ find rule /;
use Path::Tiny qw/ path /;
my @subdirs = rule( 'directory' , maxdepth => 1, )->in( 'startdir' ); 
for my $dir ( @subdirs ){
    my $listFile = path( "$dir/List.txt" )->openw_utf8;
    rule(
        file =>
        exec => sub {
            ## my( $shortname, $path, $fullname ) = @_;
            print $listFile "$_[2]\n";
            return !!0; ## means discard filename
        },
    )->in( $dir );
}

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In reply to Re^2: creating a list of files under each subfolder in a main directory by Anonymous Monk
in thread creating a list of files under each subfolder in a main directory by Bioinfocoder

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