Note that the path to the R executable is set and used in the two functions.
请注意，这里已经设置了到R可执行文件的路径，并在两个函数中使用了该路径。
The fully-qualified path to the executable must be provided.
必须提供可执行文件的完全限定路径。
When a command is executed, the shell must read the user's PATH environment variable to find the executable.
当执行一个命令时，shell必须读取用户的PATH环境变量来查找可执行文件。
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