Open the second file, read the numbers into an array. Then, initialize a hash with keys from the array:
undef @hash{@array};

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Then open the first file. Read it line by line, for each number, if it exists as a key in the hash, then increment the hash value.

Finally, go over the array and print the corresponding hash value for each member (you might skip the print if the value is not defined as in your example).

What part do you have problems with?

In reply to Re: frequency strings 2 files by choroba
in thread frequency strings 2 files by philbertcheese86

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