使用管道实现父子进程间的通信(c语言编程)；判断闰年，比较两个数的大小，文件IO操作-Father and son use the pipeline to achieve inter-process communication (c language programming) judge a leap year, compare the two the number of size, file IO operation

介绍shell脚本编程的相关内容，对于管道、输入输出重定向及通配符进行了详细的介绍。-Introduction shell scr ipt programming related content, for the pipeline, input and output redirection and wildcard characters were described in detail.