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Simple c++ exercise which run sed command from c++ program. The program is explained at: main page

  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  5. int main (int argc, char *argv[]) {
  6.   
  7.   string str("\"1223a2ee\"");
  8.   string cmd("echo ");
  9.   cmd = cmd + str + " | sed 's/\\(....\\)\\(....\\)/\\1_\\2/'";
  10.   cout << cmd << endl;
  12.   FILE* pfd = popen(cmd.c_str(), "r");
  13.   
  14.   if (pfd)
  15.   {
  16.     while (!feof(pfd))
  17.     {
  18.       char buf[1024] = {0};
  19.       
  20.       if (fgets(buf, sizeof(buf), pfd) > 0)
  21.       {
  22.         cout << "buf = " << buf; // a newline is already present
  23.       }
  24.     }
  25.     pclose(pfd);
  26.   }
  27.   
  28.   return 0;
  29. } //main

The output looks like:
  1. echo "1223a2ee" | sed 's/\(....\)\(....\)/\1_\2/'
  2. buf = 1223_a2ee

a better example

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