It launches a special program, env, that in turn launches the first instance of squirrelsh found in your PATH variable.
它启动了一个特殊的程序env，此程序又启动PATH变量中找到的第一个squirrelsh实例。
The ENV is a unique string that identifies the server.
ENV是唯一标识服务器的字符串。
Printing the contents of % ENV with a one-liner.
用一行代码打印%ENV内容。
The -Denv=dev statement creates a system property named env and sets its value to dev, which activates the development configuration.
Denv=dev语句创建一个名为env 的系统属性，并将其值设为 dev，这激活了开发配置。
You can get a listing of other environmental variables that have been set by typing env at the prompt.
在命令提示符处键入env可以获得已经设置的其它环境变量。
Then, create a directory called env.
然后，创建叫作env的目录。
Then, create a directory called env.
然后，创建叫作env的目录。
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