current directory path

基本解释

Remember to include your current working directory in your path if you want to run a class in it
如果要在当前工作目录中运行类，那么请记住，要将该目录包含在您的路径中
The first parameter is the string you want to replace in the current directory path. The second parameter is the replacement string.
第一个参数是当前目录路径中需要替换的参数，第二个参数是替换字符串。
Don't include the current directory in PATH, which can be written as "." or even as a blank entry (so a colon at the beginning or end would probably be exploitable).
不要向 PATH 中添加当前路径“.” ，或者甚至一个空条目（这样在开始和结束的冒号可被利用）。