Since eval might be considered evil, another more obscure solution would
be to use arrays which are also supported by both shells. For example:

CMD=(date -u)
"${c...@]}"

However, this will not work with dash, so the compromise is either to
use eval which works almost everywhere or arrays which works on real
shells.

-- 
Virt-manager unable to display guest consoles when connecting to a host user 
who is using the zsh shell
https://bugs.launchpad.net/bugs/556113
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