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.
但是，如果您遇到困难，可以查看一下环境变量。
However, if you're having difficulty, take a look at your environment variables.
但是，如果您遇到困难，可以查看一下环境变量。
However, if you're having difficulty, take a look at your environment variables.
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