If you use a lot of command line tools and you'd like one for searching Google, this site could be an option. You won't get an application that runs in the command line, but a search box that follows you wherever you go and lets you enter arguments that specify the type of search and the query. For example, to find images of cute cats, you'll need to type:
/images cute cats
/img cute cats
The "command line" at the bottom of the page is barely noticeable and saves you one click and one page load, assuming you search from your browser's search box and you don't have Google Image Search as an option.