a straight equality comparison can also be done by sort | uniq -c unix/linux utilities, which will give you the count of the common sequences. but you could also just work with the sort output with a script that notices when the sequence changes from the last read one. store the sequence identifier in second column and only use the first column (sequence) for the sorting.
the hardest line to type correctly is: stty erase ^H

In reply to Re^3: Bioinformatic task by aquarium
in thread Bioinformatic task by uvnew

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