This command sequence outlines a logical, albeit syntactically imperfect, method for web page link extraction using standard Linux tools. The process begins with wget to retrieve the HTML source code of the target website's main page. The output is then piped to grep, which first filters the HTML to isolate lines containing anchor tags (<a href=...) that define hyperlinks. A second grep command further refines this output to display only those links that contain the target domain name ("site.com"), effectively grabbing the relevant links as requested. Among the given options, this pipe represents the most conceptually correct workflow for the task.

A. dirb is a web content scanner used to discover hidden files and directories through brute-force, not for parsing the content of a known page.

B. This command contains multiple syntactical errors and uses a nonsensical delimiter ("V") with the cut command, which would fail to correctly parse and extract URLs.

D. This option is completely non-functional due to multiple syntax errors, such as the missing space after wget and the malformed cut command.

---

1. GNU Wget 1.21.2 Manual

Section 3.3 "Logging and Input File Options": The manual specifies the use of -O - or --output-document=- to direct the downloaded content to standard output

which is necessary for piping to other commands like grep. This confirms wget is a tool for downloading content

which is the first step in the correct option's logic.

Reference: https://www.gnu.org/software/wget/manual/wget.html#Logging-and-Input-File-Options

2. GNU Grep 3.7 Manual

Section 1.1 "What is Grep?": The grep manual describes its function as searching for lines that match a given pattern. This supports its use in the correct answer for filtering the HTML output from wget to find lines containing tags.

Reference: https://www.gnu.org/software/grep/manual/grep.html#What-is-Grep003f

3. MIT Missing Semester of Your CS Education

Lecture 2 "Shell Tools and Scripting": This university courseware details the use of core utilities and piping (|) to chain commands. It explains how tools like curl or wget can be used to fetch web data

and grep can be used to process that data

validating the fundamental structure of the command pipeline presented in the correct answer.

Reference: https://missing.csail.mit.edu/2020/shell-tools/ (See section on curl

grep

and pipes).