Put quotes around variables that might contain spaces.
Put quotes around variables that might contain spaces.

Bourne does the dumb thing when substituting vars; this helps that. Bash does the smart thing but is unhurt by this.

We don't do it to $SUDO because Bourne takes "" as a command rather than a no-op, and we don't want the SUDO= case to generate command-not-found errors.
dietsche/letsencrypt,wteiken/letsencrypt,jtl999/certbot,stweil/letsencrypt,wteiken/letsencrypt,jsha/letsencrypt,bsmr-misc-forks/letsencrypt,lmcro/letsencrypt,stweil/letsencrypt,DavidGarciaCat/letsencrypt,jtl999/certbot,letsencrypt/letsencrypt,thanatos/lets-encrypt-preview,letsencrypt/letsencrypt,mitnk/letsencrypt,DavidGarciaCat/letsencrypt,dietsche/letsencrypt,twstrike/le_for_patching,thanatos/lets-encrypt-preview,brentdax/letsencrypt,TheBoegl/letsencrypt,brentdax/letsencrypt,bsmr-misc-forks/letsencrypt,TheBoegl/letsencrypt,lmcro/letsencrypt,jsha/letsencrypt,mitnk/letsencrypt,twstrike/le_for_patching