lee_tiempo.sh

#!/bin/bash

  for (( i = 1; i <= 30; i++))
  do
    for (( k = 1; k <= 30; k++))
    do
       j=`head -$i tiempo_$k.txt | tail -1 | cut -f1`
       touch promedio_"$j".log
       head -$i tiempo_$k.txt | tail -1 | grep $j | cut -f2 -d" " >> promedio_"$j".log
    done
  done