ログ(単位時間当たり)簡易集計スクリプト

#!/bin/bash
count=0
before=""
keyword="status=sent"

tail -f /var/log/maillog | grep --line-buffered "$keyword"|
while read line;do
  now=$(echo $line|cut -f2 -d' ')
  if [ "$before" = "$now" ];then
    count=$[count+1]
    echo -ne "$now $count\r"
  else
    if [ "$before" ] ;then
      echo -ne "$before $count\n"
    fi
    echo -ne "$now 1\r"
    count=1
    before=$now
  fi
done