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  • Thanks muru (+1). I think the last version is the least fiddly, although it'd be nice to specify both files with the initial command. I tested vim's -c <command>, but sudoedit won't take that. Presumably there are no other options? Commented Jan 10, 2018 at 6:19
  • @Sparhawk sudoedit treats all arguments as filenames, so the only way to pass on options to Vim via sudoedit would be to write a wrapper script. So as long as you have to specify a user-editable file, this would be a problem. See update for a possible wrapper script. Commented Jan 10, 2018 at 6:30
  • Gosh, that's pretty clunky, too. I think the third is still probably easier. Looks like it can't be done in a simple fashion, so I'll accept this answer, unless anything else comes along. Cheers. Commented Jan 10, 2018 at 6:32
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    @Sparhawk you're using an alias anyway, so you can wrap the 4th method in a function instead: sudodiff () { SUDO_EDITOR="/path/to/foo.sh" DIFF_FILE="$2" sudoedit "$1"; }. Then the only clunky part is creating the wrapper script for first use. Commented Jan 10, 2018 at 6:35