result of a command substitution becomes a list by splitting on newlines ($IFS)

所以

>每行列出一个项目;
然后在命令替换中捕获.

清单

function __list_public_keys
    for key in ~/.ssh/*.pub
        echo $key
    end
end

产量

$__list_public_keys
/home/ed8/.ssh/id_rsa.blabla.pub
/home/ed8/.ssh/id_rsa.pub
/home/ed8/.ssh/id_rsa.test.pub

捕获

function __add_keys
    set keys (__list_public_keys)

    echo "[" $keys "]"
end

产量

$__add_keys
[/home/ed8/.ssh/id_rsa.blabla.pub] [/home/ed8/.ssh/id_rsa.pub] [/home/ed8/.ssh/id_rsa.test.pub]