Replace a string with other one

Question

I want to replace a string "#security" with "security\n\tauthorization : enabled" in a file file.txt. Here \n represents a new line and \t for tab. How can I do this using sed command.

Answer 1

sed 's/#security/security\n\tauthorization : enabled/' file

If you want to edit your file "in place" use sed's option -i.

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See: man sed