thank you. this is great, I thought of using a subroutine but was getting it wrong. But your script isn't working. To me it looks as if you are only passing the $prophage to the subroutine, but you must also pass the hash? I tried editing it as follows. But I am recieving an error about passing a string to a hash reference.

 my ($prophageB, $hostB, $taxidB) = getTaxId($columns[0],%tax2loc);

In reply to Re^2: grep keys in hash and retrieve values by AWallBuilder
in thread grep keys in hash and retrieve values by AWallBuilder

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