The piece-parts to get Linux - I mean, Android - up and running are in the /etc directory. If you're looking at the directory in a terminal window, depending on its settings, you may not notice that some of the entries are themselves directories, so watch out for that.
If it's a file-corruption problem, there are other places within /etc too, such as fstab or whatever Android calls it. (Sorry, don't have a device handy to check.)
-- Ed
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