The Silver Searcher (also known as Ag) is a powerful, open-source command-line-based file search and indexing tool for Windows, Linux, and Mac. It's designed to quickly locate files and directories based on their name, size, or content. It’s fast, efficient, and has a low memory footprint. It uses a powerful algorithm to quickly locate files in your directory tree. It allows users to customize the search criteria and also allows for advanced search options such as regular expressions. It also supports searching inside archives and binary files, and can be used to check for duplicate files. The Silver Searcher also comes with a powerful command-line interface that makes it easy to use and customize.
The discontinued official site has been replaced with few sentences of text without links thanking the last 25 years. The program can be safely downloaded from CNET aka Download.com.