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Maybe you can adopt this, I call it floyd
#!/usr/bin/perl -- use strict; use warnings; my(@list ) = sort qw[ abcpwbln08 abcpwbln07 abcpwbnn10 abcpwbnn06 adesicln09 adesicln08 adesicln01 adesicnn05 ]; use Data::Dumper; my $len = length 'abcpwbnn'; my $ret = floyd( \@list, $len, ) ; print Dumper($ret),"\n"; for my $ar( @$ret ){ if($#{$ar} > 0){ print substr $ar->[0], 0, $len; print "*\n"; } else { print $ar->[0],"\n"; } } sub floyd { my ( $input, $len ) = @_; my %output; keys %output = scalar @$input; #presize %output, max possible my @keys; my $num_keys_l = 0; for my $i( @$input ){ my $ikey = substr $i, 0, $len; push @{$output{$ikey}}, $i; my $nkeys = 0+ keys %output; if( $nkeys > $num_keys_l ){ $num_keys_l = $nkeys; push @keys, $ikey; } } return [ @output{@keys} ]; } __END__ $VAR1 = [ [ 'abcpwbln07', 'abcpwbln08' ], [ 'abcpwbnn06', 'abcpwbnn10' ], [ 'adesicln01', 'adesicln08', 'adesicln09' ], [ 'adesicnn05' ] ]; abcpwbln* abcpwbnn* adesicln* adesicnn05

In reply to Re^3: Collapsing a list of files... by Anonymous Monk
in thread Collapsing a list of files... by fiddler42

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