#!/bin/sh
name=${0##*/}
log=/var/log/$name
date=$(date +%Y%m%d%H%M%S)
value=$(sysctl $name|awk -F= '{print $2}'|awk '{print $1}')
[ -f $log ] || { echo $date:$value>>$log;exit 0; }
[ $value = $(tail -1 $log|awk -F: '{print $2}') ] || \
echo $date:$value>>$log