Which of the following sed commands will replace all instances of the string foo with the string foobar …

Which of the following sed commands will replace all instances of the string foo with the string foobar changing the file file1.txt in place?

Which of the following sed commands will replace all instances of the string foo with the string foobar changing the file file1.txt in place?

A.
sed ‘s/foo/foobar/g’ file1.txt

B.
sed ‘s/foo/foobar/g’ file1.txt > file1.txt

C.
sed ‘s/foo/foobar/g’ file1.txt | file1.txt

D.
sed -i ‘s/foo/foobar/g’ file1.txt

E.
sed -i ‘s/foo/foobar/g’ file1.txt > file1.txt

Explanation:
When using the option -i, –in-place sed creates no output, but changes the source file itself.
You can not use redirection (B) because file1.txt would be empty before starting sed.



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