Hi everyone, I am a relative newcommer to Perl and am a little bit stumped. I have been given 2 text files, 1 containing a list of different processes and genes linked to the processes if the form below: 
Check point factors    CCNA1
Check point factors    CCNA2
Check point factors    CCNB1

[download]
Another is containing the same list of genes and lists of species and whether the genes are present in certain species like this: 
HFM1    1
EME2    0

[download]
Essentially what I want to do is: Select a specific process and pull out all of the genes that are linked to it from the first file, then use the genes from the first file (in the form of an array) to see if a species contain the gene or not by comparing it to the second file. How would I go around creating an array of the selected genes then use that array to search the second file? I know this is probably very badly worded, but any help would be amazing. If you need some more information to help you understand it, don't hesitate to ask. Chris

In reply to Creating and using an array with different files by Chrispm

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