Practical applications and best practices

This section will further solidify your understanding of parallel processing in Bash by showing practical applications. This will be followed by best practices to help you get the most out of learning these concepts.

Practical applications of Bash parallel processing

In this section, we will use examples to show the real-world usage of Bash parallel processing in pentesting.

The first example uses GNU parallel for SQL injection testing, as shown in the following code:

#!/usr/bin/env bash
urls=("http://example.com/login.php" "http://test.com/index.php" "http://site.com/search.php")
echo "${urls[@]}" | parallel -j 3 'sqlmap -u {} --batch --crawl=2'
echo "All SQL injection tests completed."

The code can be found in the book’s GitHub repository as ch07_parallel_2.sh. Here’s an explanation:

• urls is an array of URLs to test
• echo "${urls[@]}&quot...