Linux下用tar进行系统备份脚本

#!/bin/bash
backupdir=/media/LinuxShare/systembackup
dir1=/bin
dir2=/boot
dir3=/etc
dir4=/home
dir5=/lib
dir6=/opt
dir7=/root
dir8=/run
dir9=/sbin
dir10=/selinux
dir11=/srv
dir12=/usr
dir13=/var
if [ `id -u` -ne 0 ]
then
    echo "Need to be ROOT to run backup script."
    exit 1
fi

if ! cd $backupdir 2> /dev/null
then
    echo "Can not find directory $backupdir.Backup fails."
    exit 1
fi
for i in $dir1 $dir2 $dir3 $dir4 $dir5 $dir6 $dir7 $dir8 $dir9 $dir10 $dir11 $dir12 $dir13
do
    echo $i
    tar zcvf $backupdir/`basename $i-`$(date +%Y%m%d).tar.gz $i
done

if [ $? -eq 0 ]
then
    echo "Backup succeed." | mailx -s "SystemBackup Notification" [e-mail]
    exit 0
else
    echo "Backup fails." | mailx -s "SystemBackup Notification" [e-mail]
    exit 1
fi