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no need that useless cat.
you can just use one awk script to parse the rss feed. No need to pipe so many awk's and sed's. Its ugly and inefficient.
don't have to be that complicated
no need to use grep.
no need grep. its redundant when awk is present.
if its the current directory, no need find command. just grep will do
touch a dummy file with the specified date, then use find with -anewer .
GNU find + sort