#!/bin/bash# defineday_of_week=`date "+%u"`today=`date "+%Y%m%d"`source=/mnt/vg1/volume1/backup=/r1/# actioncd $backupif [ $day_of_week -eq 7 ]; then  if [ ! -f "full$today.tar.gz" ]; then    rm -rf snapshot    echo starting full_backup    tar -g snapshot -zvcf "full_$today.tar.gz" $source    tar exccuted...  fielse  if [ ! -f "inc$today.tar.gz" ]; then    echo starting incremental_backup    tar -g snapshot -zvcf "inc_$today.tar.gz" $source    echo done  fifi# delete file before 7days agoecho delete old files...find $backup -type f -mtime +7 -exec rm -f {} \;

crontab：

[root@file ~]# crontab -lMAILTO=""10 */12 * * * /root/tar_backup.sh >> /root/cron_tar_backup.log[root@file ~]#