Web Development and Unix Fundamentals

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Question 1 of 20

What is the command to find the differences in the lines containing "1999" between the files orig.txt and copy.txt, and add the result to file result.1999?

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diff orig.txt -d copy.txt | grep 1999 > result.1999

diff orig.txt copy.txt | grep 1999 >> result.1999

grep 1999 *.txt >> result.1999

diff orig.txt copy.txt | grep 1999 << result.1999

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