在Linux上寫一支Shell收集ping log

今天盤中發生使用者反映連線異常，檢查時發現與對方主機並未斷線，但系統沒有發生時的log，所以寫一支Shell每3秒ping 一次對方主機，放在Cron上定時啟動執行

[root@localhost root]# vi ping003.sh

#!/bin/bash

date1=$(date +%Y%m%d)
x=1
HOST="10.1.1.200"
while [ "${x}" != "8400" ]
do
  count=$(ping -c 1 -n -W 3 $HOST | grep 'received' | awk -F',' '{ print $2 }' | awk '{ print $1 }')
  if [ $count -eq 0 ]; then
    echo "$(date +'%Y%m%d %T') $HOST is down" >> /root/ping_$date1.log
  else
    echo "$(date +'%Y%m%d %T') $HOST is up" >> /root/ping_$date1.log
    sleep 3
  fi
  x=$(($x+1))
done

[root@localhost root]# crontab -l

# DO NOT EDIT THIS FILE - edit the master and reinstall.

# (/tmp/crontab.30959 installed on Fri Mar 31 16:44:34 2017)

# (Cron version -- $Id: crontab.c,v 2.13 1994/01/17 03:20:37 vixie Exp $)

# Monitor remote host every 1 minutes using /root/ping001.sh

0 8 * * * /root/ping003.sh