> Documentation for the -D option to importas: "If envvar is undefined, > and this option is not given, substitute zero word for variable instead > of the empty word".
Few lines above: "If neither the -D nor the -i option is given, and envvar is undefined, the null word is returned." so it uses "zero word" and "null word" interchangeably, which doesn't help either :) "zero word" seems closer to "empty word" (==no magic,just ''), than to "null word" (magic)
