1、http://blog.csdn.net/chinalinuxzend/article/details/2403613
最近项目又要求写shell脚本完成相应升级工作，无奈，这工作又落在我脑袋上，于是我还得在学习学习。
添加一段测试时间戳的简单脚本：
#
#Ghetto auto SCP script Bryan Encina 10-16-2003
#
#Assumptions: passwordless SCP has been setup via generation of private/public
# keypair and insertion of pub key to webhost user's
# .ssh/authorized_keys file
#Intended Use: uploading webcam image from linux server to another webhost
# that does not support FTP (only SCP), probably of no use to anyone else
#Usage: make an entry in your crontab to run as the user who's setup for passwordless scp
# to run this script with the path to your webcam img as a
# command line arg
#user settings edit the vars below
checkduration=300 #if current - timestamp is less than this we have a new file default to 5 minutes
remoteuser=myremoteuser #user at remote host
mydomain=mydomain.com #the domain/ip of your remote host
destpath=yourfile #the path to your remote file
#do not edit below unless you know what you're doing, but if you did you
#wouldn't be using this and you'd be writing your own wouldn't you?
localfile=$1
cur_timestamp=`date +%s`
my_stat=`stat -t $localfile 2>/dev/null`
read name size blocks unk uid gid dev inode links unk2 unk3 last_access last_mod last_change ioblock << ENDHERE
$(echo $my_stat)
ENDHERE
if [ $last_mod ]
then
time_diff=`expr e$cur_timestamp - $last_mod`
if [ $time_diff -lt $checkduration ]
then
#echo This is a recent file
scp $localfile $remoteuser@$mydomain:$destpath
fi
fi
#Ghetto auto SCP script Bryan Encina 10-16-2003
#
#Assumptions: passwordless SCP has been setup via generation of private/public
# keypair and insertion of pub key to webhost user's
# .ssh/authorized_keys file
#Intended Use: uploading webcam image from linux server to another webhost
# that does not support FTP (only SCP), probably of no use to anyone else
#Usage: make an entry in your crontab to run as the user who's setup for passwordless scp
# to run this script with the path to your webcam img as a
# command line arg
#user settings edit the vars below
checkduration=300 #if current - timestamp is less than this we have a new file default to 5 minutes
remoteuser=myremoteuser #user at remote host
mydomain=mydomain.com #the domain/ip of your remote host
destpath=yourfile #the path to your remote file
#do not edit below unless you know what you're doing, but if you did you
#wouldn't be using this and you'd be writing your own wouldn't you?
localfile=$1
cur_timestamp=`date +%s`
my_stat=`stat -t $localfile 2>/dev/null`
read name size blocks unk uid gid dev inode links unk2 unk3 last_access last_mod last_change ioblock << ENDHERE
$(echo $my_stat)
ENDHERE
if [ $last_mod ]
then
time_diff=`expr e$cur_timestamp - $last_mod`
if [ $time_diff -lt $checkduration ]
then
#echo This is a recent file
scp $localfile $remoteuser@$mydomain:$destpath
fi
fi