CompTIA Linux+ XK0-006 (V8) Practice Question

Using an unquoted delimiter with the standard here-document operator (<<) allows the shell to treat the body of the document like a double-quoted string: parameter expansion and command substitution occur. Crucially, all characters, including literal leading spaces, are copied to the command's standard input. This meets both requirements. Quoting the delimiter (<<'EOF') disables all expansions, so $SERVERNAME and $DOCROOT would be written literally. The <<- operator strips leading tab characters from each line of the document. Because the required indentation consists of spaces, this operator is not the correct tool for the job. The <<< operator is a here-string, not a here-document; it is designed to supply a single string to a command's standard input and is not the correct tool for embedding multi-line blocks of text. Therefore, the construction that uses an unquoted delimiter with << and a >> redirection is the only choice that satisfies both requirements.