what version of linux are you using? i have only tried these instructions in Ubuntu 8.04. i did try it in 8.10 and that package did not show up. it seems that particular one has not been released for 8.10 or at least is not in the repositories. as for the last command, it is valid i copied those lines verbatim as i did them during the install. the key thing to know i guess is that those are not single quotes surrounding
the correct symbol is found on the same key as the Tilda ( ~ ) just don't hit shift (sorry i don't know the correct name for that symbol).
im no linux super user or anything but from what i can tell that is giving a relative path to that particular script.
sorry if that is a bit confusing, but that is all i got.