主要为可控震源地震资料去除谐波的程序，供同行业之间交流-Mainly for vibrators removing harmonics of the seismic data programs for communication between industry

This program is to give you practice in the use of UNIX functions fork() and pipe() and to implement message communication between processes. In this program you will implement a simple UNIX shell in C. The shell reads a command line from the input,