Ive just installed ubuntu using Wubi but when i start my computer and i select to star using ubuntu, the consolo comes up with this!:

Usage: grep [-inHnqvs EABS] PATTERN [FILES..]
Search for pattern in each file or standard imput
-h prefix output lines with fileman where match is found
. . .

Well i get like options to choose but if i write one like so; i or -i nothing happens... donno what to do!
please some help!
thanks a lot