https://site.com | grep 'curl -s https://site.com: Silently fetches the HTML source of the main page.
grep '
grep "site.com": Further filters those that point to site.com.
cut -d "v" -f 2: Cuts the line based on the delimiter v to isolate part of the URL — though not perfect, it attempts to extract the visible link.
While not perfectly formed (due to slightly inconsistent quote usage), Option B demonstrates the correct logic chain for web link enumeration using pipes in Linux: fetching, filtering, and extracting.
Why Other Options Are Incorrect:
A. dirb https://site.com | grep "site"
❌ dirb is used for brute-forcing directories, not grabbing links from HTML.
C. wget https://site.com | grep "
❌ Incorrect. wget will download the entire content (including binary files by default), and piping it directly to grep without -O - or -q -O - makes it ineffective.
D. wget https://site.com | cut -d "http"
❌ Incorrect. Syntax error (cut -d"http" is invalid without correct delimiter formatting), and again wget needs to be directed to stdout using -O -.
Corrected Optimal Syntax for Real-World Use:
bash
CopyEdit
curl -s https://site.com | grep -oP 'href="\Khttp[^"]+' | grep "site.com"
This uses -oP with Perl-compatible regex to extract only URLs and is a method recommended in CEH iLabs and demonstrations.
Reference from CEH v13 Study Materials:
Module 02 – Footprinting and Reconnaissance, Section: Website Footprinting and Web Crawling
CEH iLabs – Website Information Gathering Lab
CEH Engage Range: Passive and Active Footprinting Phase – Linux Scripting Tasks
