Extension of the original gSAST. Grep Static Analysis Security Tool or gSAST is a tool that gustavo bonito developed for the OSWE certification, using shell scripting (bash), in order to simplify the process of manual source code analysis.
A complete demonstration of the original gSAST can be found on gustavo bonito's website.
Note: It is important to note that gSAST is not any sort of vulnerability scanner.