You're not that far off, I think your code would work if you replaced line 8 with $wo_usr_proj{$project} = \@usr_list; - hash values must be scalars, so a reference is needed.

Your code can be cleaned up a bit. You can read data directly from the file, for (<INFH>) { Loop variables are better as lexicals, and split uses $_ as the default second argument,     my ($user, undef, $project) = split /\|/; The remainder can be condensed to a conditional push onto the dereferenced array in the hash, 

    push @{$wo_usr_proj{$project}}, $user
        if $uo_hash{lc($user)} =~ /WO/;
}

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After Compline,
Zaxo

In reply to Re: dealing with arrays as hash values by Zaxo
in thread dealing with arrays as hash values by goonarific

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