Filter MTR output to prevent it from clearing screen after finishing (tested on Cygwin). It works by messing with the ANSI codes

filterMTR.c

/*
MTR is an enhanced traceroute tool for Linux and friends

Needs:
   Cygwin (tested with 32 bit version, 2017-05-10).
   MTR built from https://github.com/traviscross/mtr
   
Simple compiling:
   gcc -o procesarmtr.exe procesarmtr.c
   
Invoke mtr using:
  real-mtr -b "$@" | procesarmtr.exe | cat
  (where real-mtr is the path to the actual mtr binary)

*/

#include <stdio.h>

int main(int argc, char **argv) {
 int a1,a2,a3,a4,a5,a6,a7;
 int filas;
 int maxfilas=10;

 setbuf(stdout,0);

 do {
 a1=a2;
 a2=a3;
 a3=a4;
 a4=a5;
 a5=a6;
 a6=a7;
 a7=getchar();

 // Contar las filas, ej: "ESC[12;5H" son 12 filas
 if (a1=='\x1b' && a2=='[' &&
   a3>='0' && a3<='9' &&
   a4>='0' && a4<='9' &&
   a5==';' &&
   a6=='5' && a7=='H'
   ) {
   filas = (a3-'0')*10 + a4-'0';
   if (filas > maxfilas)
      maxfilas=filas;
 }

 // Interceptar ?47h al principio para que no borre la pantalla
 if (a2=='\x1b' && a3=='[' && a4=='?' && a5=='4' && a6=='7' && a7=='h') {
  a7='l';
 }

 // Interceptar 2J (limpiar pantalla al final)
 if (a5=='[' && a6=='2' && a7=='J') {
  // Convertirlo en: 2C H 15B.  (2C=nada, H=ir al inicio, 15B=bajar 15)
  printf("C\x1b[H\x1b[");
  printf("%d",maxfilas+1);
  printf("B");
  return 0;
 }

 if (a7 != EOF)
  putchar(a7); 

 } while (a7 != EOF);
}