title: how to print logs into only one file by google glog
body: <p>I'm now using google glog. When I'm debugging the program, every time the process restart, a new log file generated, identified by the new pid as filename's sufix, like this</p>
  
  <pre><code>ied_config.20131220-142934.4524
  ied_config.20131220-171227.3948
  ied_config.20131225-170117.7032
  ied_config.20131225-170131.5200
  ied_config.20131225-171450.7820
  ied_config.20131225-172336.4116
  ied_config.20131225-172924.6120
  ied_config.20131225-173000.2980
  ied_config.20131225-173037.1960
  ied_config.20131225-173144.7304
  ied_config.20131226-095843.1012
  smv_client.20131219-082120.7184
  smv_client.20131219-162339.5508
  smv_client.20131219-163055.6156
  smv_client.20131219-163155.4892
  smv_client.20131219-163206.5576
  smv_client.20131219-163216.6340
  smv_client.20131219-163236.6952
  smv_client.20131219-163307.7940
  smv_client.20131219-163317.4920
  smv_client.20131219-163347.6556
  smv_client.20131219-163408.5124
  smv_client.20131219-163428.2644
  smv_client.20131219-163448.6040
  smv_client.20131219-163529.6948
  smv_client.20131219-163539.1592
  smv_client.20131219-163549.3776
  smv_client.20131219-172949.5412
  smv_client.20131219-173000.4180
  smv_client.20131219-173010.7432
  smv_client.20131220-170628.636
  smv_client.20131220-170930.3904
  smv_client.20131226-095841.1296
  </code></pre>
  
  <p>I want to join these log just into one file for each program, I can't file the configuration for the glog ,any helps?</p>