此外还建议您查看所有可选环境变量和属性的当前设置。
It is also recommended that you review the current Settings for all optional environment variables and properties.
要查看当前所有的环境变量，可以输入printenv，如清单6所示。
To see all your current environment variables, type printenv, as shown in Listing 6.
要查看您的shell中设置了哪些环境变量，键入printenv命令。
To see which environment variables are set in your shell, type printenv.
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