linux 下的shell编程，一些基础的shell编程内容，谢谢！-example： echo "this is the $numnd" grep "hello" file.txt | wc-l and so on!

对一篇由英文字母、空格、标点符号构成的文档，进行Huffman编码 数据输入： 由文件input.txt给出输入数据。 输入文件示例 input.txt A priority queue is a queue where each element has a priority and the element with the highest priority is at the front of the queue and will be the first elemen