`ls` is not the same command in nu. There's a nu-specific `ls`.

My GNU `ls` has `--literal`, but to do that in nu, you have to do `^ls --literal`, to use the external command instead of the nu builtin.

You can see the nu `ls` options with `help ls`, or `ls --help`. `--literal` is completely useless for nu's `ls` anyway. `nu`'s ls gives a table, where the `name` column is the filenames. There's no need for any quoting, because it's already structured output.