A shell script is a script written for the shell, or command line interpreter, of an operating system. It is often considered a simple domain-specific programming language. Typical operations performed by shell scripts include file manipulation, program execution, and printing text. Usually, shell script refers to scripts written for a Unix shell, while DOS and Windows command line scripts are called batch files.

1. netcat source installed with custom shell script - Shell script used in installing netcat source

2. Installing Lynx (source) via custom shell script - A package management shell script in OpenBSD (ksh), and basically, you just provide the complete URL to a file online, and the script will do everything for you, including compiling the source! It's in early alpha stages right now, and I plan to release the entire source code once it's complete.