linux数据备份脚本

注意:unix（freebsd）系统的bash位置为：!/usr/compat/linux/bin/bash ,linux的bash位置为：/bin/bash,位置要准确．
备份数据：比如对/etc/passwd,/etc/named.conf及/var/log进行备份，备份数据到/var/backup中
脚本如下：
#!/bin/bash
# get current datetime　　　　
datestr=`date '+%Y%m%d-%H%M%S'`
BACKUP_DIR=/var/backup/$datestr/
# make dir of backup dir
if [ ! -d $BACKUP_DIR ]
then
mkdir -pv $BACKUP_DIR
fi
# rename existing backup dir if it is a file
if [ -f $BACKUP_DIR ]
then
mv -v $BACKUP_DIR $BACKUP_DIR.bak
mkdir -pv $BACKUP_DIR
fi
datestr1=`date '+%Y%m%d'`
#backup /etc entry
cp -p /etc/passwd /etc/master.passwd /etc/named.conf $BACKUP_DIR
#backup /var/log entry　
echo Please wait for a moment.The program is backuping /var/log entry ......
tar zcf /var/log.$datestr1.tar.gz /var/log
mv /var/log.$datestr1.tar.gz $BACKUP_DIR