test1.c

这个是学习嵌入式开发的重要例子

#include <stdio.h>

int main(int argc, char **argv)
{
  // step 1, get commands from user input.
  // step 2, parse command and get all commands
  // step 2.5, create a pipe
  // step 3, fork
  // step 3.1, ls process close stdout, and write output to pipe
  // step 3.2, grep process close stdin, and read data from pipe
  // step 4, exec(ls)
  // step 5, exec(grep)

  return 0;
}