extracting a group of keys

[Adriano Allora]

Hi to all,
I have to compare each line of a very long text file with each line of 
another one.
I stored all the first file lines in an hash - to make the process 
faster.
Now I have that hash with the first word of each line in the value of 
hash and the entire line in the related key (cause I cannot have 
identical keys but I can have identical value).
Now I need to extract the keys --->

while(<SECONDFILE>)
        {
        /^(\S) /;
        foreach values(%control) == $´
                {
                # here I sholud extract all the keys with the selected value
                ## here other blocks
                }
        }
How can I do this?

Thank you very much,

all'adr

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