kanshi-shell

#!/bin/bash

target=ntpd
logfile=/var/log/origin.log

function timestamp() {
  echo "`date '+%y/%m/%d %H:%M:%S'`"
  return $?
}
#echo `timestamp`

#ps -C $chk -o comm= > /dev/null || sudo /usr/sbin/$chk

function res() {
  echo `ps -C $target -o comm= | head -n 1`
  return $?
}

if [ ${target} = "`res`" ]; then
  echo "`timestamp` [$target] status is running" >> $logfile
  exit 0
else
  echo "`timestamp` [$target] status is error" >> $logfile
  echo "`timestamp` [$target] trying start" >> $logfile
  service $target start
fi

if [ ${target} = "`res`" ]; then
  echo "`timestamp` [$target] status is running" >> $logfile
  exit 0
else
  echo "`timestamp` [$target] start failed(unknown error)" >> $logfile
  #mail....
fi