Default File System Repair

I've got a G1 which I suspect of having major FS corruption (apps and data disappearing and corrupting). I don't have A2SD, so I need to repair the inbuilt filing system. Can anyone tell me the command to do this?

I tried e2fsck /dev/block/mmcblk0p2 but I get file not found. And something about super block not being there. I don;t even think that's the command I need!

Any help would be appreciated, my phone is totally unusable at the moment.