I'm looking for an iPad/iPhone app that can handle editing large (~10000 line) text files. I would like this app to be able to access a particular Dropbox file quickly, and after editing have the file be updated on Dropbox.
Finally, I would be happy if it only allows me to edit the first few lines, or to add to the top of a particular file. (I currently have a cronjob which does this -- I edit a particular blank text file, and the cronjob adds it to the top of the larger file, but would like a more direct solution.)