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Alex Rivera
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Using the GNU date command line utility, I know: how to substract 3 days from any given date: date -d "20110405 -3 days" "+%Y%m%d" 20110402 how to get the last Friday from today: date -d "last friday" "+%Y%m%d" 20110408 But I don't know how to get the last Friday from any given date: date -d "20110405 last Friday" "+%Y%m%d" Simply returns the given date: 20110405 Any ideas on how to do this? If a one-liner is not possible a few lines of script would also be helpful.
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