Description: Pipeline is the UNIX system and UNIX-systems support the communication mechanism, it is also inter-process communication (IPC, Inter-Process Communication) is one of the oldest forms. Pipes are half duplex, and if you want to achieve two-way communication, you need to build two pipelines. Pipeline can only be used with a genetic relationship between the process of communication, if two totally unrelated processes to communicate, you need to use named pipes, or FIFO. In this study, the parent process read data from the console, write to the pipe string. Parent process child process will be over by the tunnel system conversion case characters, and then loaded back to the parent for the character after the process. Redhat9.0 experimental environment
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