A list of commands is accessible by entering ls into the form field. I think an example will illustrate the strength of yubnub; wp ghacks searches wikipedia for the term ghacks, gim ghacks searches google images for ghacks. y or g searches yahoo or google for a selected search term. That is not all of course. AM title searches amazon for the title that you enter, random 1000 returns a random number between 1 and 1000.

A good selection of commands that should be useful for most users are Jeremy’s Picks which displays a list of about 100 commands. It is possible to create your own commands. You do select a command string that is not used yet and select a url that uses variables to perform searches or operations. One example would be http://images.google.com/images?q=%s which is simply the search string for google images.

The search string that is entered is substituted with %s in this example. It is possible to create more advanced searches  with more than one parameters.