You could use some archaic unix command line text editor (I’m going to get it in the neck for that comment, I’m sure), or open up something like BBEdit – my editor of choice – and navigating to the file – a location that no matter how often I go there, I can never remember the precise path.

GasMark saves you the hassle. It is, simpy, a direct line to your hosts file, allowing editing on the fly as easily as clicking its Dock or menu bar icons, or using its customisable hotkeys.

There’s really nnothing else to say other than save yourself some pain and download GasMask.