I should also note that all the inserted binary data is 0x80 or higher. I don't want to just clear the 0x80 bit, that results in junk in my text. I want to delete all characters 0x80 or higher. I'm ...

Linux systems support a number of file editors – like vi, vim, neovim, ne, GNU Emacs etc. But you can also install an editor that allows you to view the contents of and make changes to binary ...