bash进行目录检查和备份

backup.sh

#!/bin/bash

#param 1: the name of the configuration
#param 2: the path to backup 
back_dir_prefix="/home/x/back/"
back_up(){
name=$1
path=$2
echo  $name " => " $path
last_back_dir="${back_dir_prefix}${name}"
echo $last_back_dir
if [ -d $last_back_dir ]; then
    echo "dir $last_back_dir exist"
    lines=`diff -r $last_back_dir $path | grep 'diff -r'|wc -l`
    #lines=`diff -r $last_back_dir $path | grep diff`
    #|wc -l`
    #lines=`diff -r $last_back_dir $path 2>&1| grep diff|wc -l`
    echo ""
    echo ""
    echo ""
    echo $lines "个文件不同"
    if [ $lines !=  "0" ];then
        #需要重新备份;
        tm=`date +%Y%m%d%H%M%S`
        tar -czf ${back_dir_prefix}/${name}.${tm}.tar.gz $path
        rsync -rv $path $last_back_dir
    fi
else
    #mkdir $last_back_dir
    rsync -rvz --safe-links $path $last_back_dir
    echo "dir not exists"
fi
}
#usage:
back_up "hello" "/etc/"