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。

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The ENV is a unique string that identifies the server.

ENV 是唯一标识服务器的字符串。

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Printing the contents of % ENV with a one-liner.

用一行代码打印% ENV内容。

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