#include <iostream>
#include <fstream>
#include <string>
using namespace std;
 
int main()
{
  string str;
 
  string err = "Windows IP Configuration"; //error string to find
  system ( "ipconfig>output.txt" );
  ifstream file ( "output.txt" ); 
 
  while ( getline ( file, str, '\n' ) )
  {
    cout << str << endl;
 
    int pos = str.find ( err );
    //cout << pos << endl;
    if ( pos > -1 )
    {
      cout << "\nerror found!\n";
      cin.ignore();
    }
  }
  file.close();
  system ( "Pause" );
  return 0;
}

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
 
int main()
{
    string line;
 
    string err ="Windows IP Configuration"; //error string to find
    system("ipconfig>output.txt");
    ifstream read("output.txt");
 
 
    while( getline(read,line,'\n') )
    {
        cout <<line<<endl;
 
        //int pos = str.find(err);  
        //cout<<pos<<endl;    
        if(line==err)
        {
            cout<<"\nerror found!\n";
            cin.ignore();
        }
 
    }
    read.close();
    system("Pause");
    return 0;
}