Hi Nick,
sudo nand-oob-strip.py e3-nand-backup.0 e3-nand.0: No such file or directory
Two things. You probably don't need sudo as your ordinary user should be able to read e3-nand-backup.0 and write e3-nand.0. You have to specify a path to the nand-oob-strip.py script for the shell to find it. Since it's in the current directory, that's just `.', i.e.
./nand-oob-strip.py in.0 out.0
If that complains, then it's because ./nand-oob-strip.py lacks the `execute' permission for you. Either add it with chmod(1), or run the Python interpreter directly:
python3 nand-oob-strip.py in.0 out.0
Alternatively, to modify the file in place, so ensure they're not your only copies, you can do
LC_ALL=C perl -i -0777pe 's/(.{512})(.{16})/$1/gs' \ e3-nand-backup.{0..5}
which substitutes every 512 bytes followed by 16 bytes with just the 512.