Linux下增量备份程序的命令形式：
1.可执行文件 源文件 as：./a sourcefile
2. 更新备份的时间：usage as:1979-01-01 10:20 : 1979 01 01 10 20
3.输入增量备份的目文件：
#获取文件的更新时间
function gettime(){
var=`ls -l $1| grep ":[0-9]\{2,\} 1" | sed 's/[ ]\{1,\}/ /g' | cut -f6-7 -d' ' | sed 's/[ -:]//g'`
echo $var
}
#对文件进行增量备份
function getdir(){
for name in `ls $1`
do
if [ -d $1"/"$name ]; then
mkdir -p $localname"/"$1"/"$name
getdir $1"/"$name
else
new_time=`gettime $1"/"$name`
if [ $new_time -ge $time ]; then
#通过增量备份时间与文件更新时间的差值对比，来确定是否进行备份
cp $1"/"$name -t $localname"/"$1"/"
fi
fi
done
}
printf "Please enter the date,time :(as:1979-01-01 10:20 : 1979 01 01 10 20)\n"
read time1 time2 time3 time4 time5
#获取增量备份时间
time="$time1$time2$time3$time4$time5"
#read time1 time2
#time="$time1$time2"
#echo $time
printf "Please enter the direction name:"
#增量备份所存文件夹
read localname
mkdir -p $localname"/"$1
getdir $1