Please for next time realize that that is not an adequate description. When you type that in a console, you see something. Then you should post that here between CODE tags (the # button in the post editor), then we can see what you saw and that is much better then any description. Like:
henk@boven:~> locate
If 'locate' is not a typo you can use command-not-found to lookup the package that contains it, like this:
cnf locate
henk@boven:~>