Which of the following commands will find the string foo in file1.txt, regardless of foo being in upper or lowercase letters?
A.
cat file1.txt | grep -i foo
B.
cat file1.txt > grep -n foo
C.
grep -i foo | file1.txt
D.
grep -n file1.txt < foo
E.
grep -n foo file1.txt
Explanation:
grep option -i tells grep to work case insensitive.
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