使用较新的 v3 版本的 easy-rsa，我找不到将数据静默输入命令行的方法：
$ ./easyrsa build-ca nopass
Note: using Easy-RSA configuration from: ./vars
Generating a 2048 bit RSA private key
...............................................................................................................................................................+++
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writing new private key to '~/EasyRSA-3.0.4/pki/private/ca.key.Dz9CBy9xV1'
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You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will …ubuntu ×1