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The value for the sort command's -k argument is the column in the CSV file to sort on. In this example, it sorts on the second column. You must use some form of the sort command in order for uniq to work properly.
There are 7 alternatives - vote for the best!
If you can do better, submit your command here.
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I was about to suggest a shorter alternative:
sort -u -t "," -k 2 foo.csv bar.csv
but I realized that sort's "-u" option only checks the comparison key for uniqueness; what you want here is to check the entire line.
But you can still avoid the UUOC (useless use of cat):
sort -t "," -k 2 foo.csv bar.csv | uniq
And the quotation marks around the comma aren't necessary, but they don't hurt anything
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