Some more Kobo startup script tweaks (#6147)
Some more Kobo startup script tweaks (#6147)

* Simplify env siphoning some more

* Nope, shellcheck, quoting this breaks it.

(it preserves the LNs instead of abusing them as free field separators with word splitting).

And, while this does break on env vars with spaces (since they'll be
unquoted), that was already the case of the xargs approach.
If we had read -d & printf %q, we could go with a pure shell approach,
but we don't ;).

* Document a working quoted variant.

For science!
mwoz123/koreader,koreader/koreader,koreader/koreader,Frenzie/koreader,Hzj-jie/koreader,pazos/koreader,Frenzie/koreader,Markismus/koreader,poire-z/koreader,NiLuJe/koreader,poire-z/koreader,NiLuJe/koreader