Parsing multiple files

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Based on the usage section it seems this tool only ingests one file. It would be nice to allow for multiple files to be fed to nmaparse to combine results from multiple scans. I have previously concatenated input files from multiple scans so that the script can parse all of it into one results folder, however, I highly doubt this is supported and I have to wonder what might happen if a host was scanned twice, with two different results listed in this concatenated input file. Would nmaparse overwrite the previous host results? Would it combine them? Would it simply spit out duplicate host lines in the summary file?

Allowing for multiple input files would be helpful. If implemented previous host results should be combined (and this info declared in the usage section for clarity). My reasoning for wanting to combine the results is to avoid deleting information. For example, if you run one nmap scan against port 443 and later you decide to run one against port 80, if the secondary scan overwrites the first, you would be left with only port 80.