根据在命令行输入的文件路径，统计显示其目录（包括子目录）下所有txt格式的文本文件数目，并统计显示其中包含的所有单词总数。



另外，提供在其中搜索某个单词的功能，按出现频率在标准输出中返回该单词在各个文本文件中的位置以及上下文。-



According to the file path in the command line input, the statistics show that all text files txt format its directory (including subdirectories) under, and statistics show that the total number of words it contains all.



In addition, to provide a word search in which the function returns the word according to frequency of occurrence location and context in each text file in the standard output.