pingでチェックする

#!/bin/bash

#set -x
#set -v

TARGET_HOST="myserver"

# 1 time, no host name, timeout 1sec
/bin/ping -c 1 -n -w 1 ${TARGET_HOST} > /dev/null

if [ $? -eq 0 ] ; then
/bin/echo "Alive"
else
/bin/echo "Dead"
fi

exit 0