[root@SZDB ~]# more purge_datedir.sh  #!/bin/bash # Author: Leshami # Blog : http://blog.csdn.net/leshami  RemoveDir=/log/hotbak/physical dt=`date +%Y%m%d -d "3 day ago"`  for subdir in `ls $RemoveDir`; do   if [ "${subdir}" /< "${dt}" ];     then      rm -rf $RemoveDir/$subdir >/dev/null     echo "The directory $RemoveDir/$subdir has been removed."   fi done 

[root@SZDB ~]# ls /log/hotbak/physical 20141203 20141210 20141217 20141224 20141231 20150107 20150114 20150125 tmp.sh 20141207 20141214 20141221 20141228 20150104 20150111 20150121 20150128  [root@SZDB ~]# ./purge_datedir.sh  The directory /log/hotbak/physical/20141203 has been removed. The directory /log/hotbak/physical/20141207 has been removed. The directory /log/hotbak/physical/20141210 has been removed. The directory /log/hotbak/physical/20141214 has been removed. The directory /log/hotbak/physical/20141217 has been removed. The directory /log/hotbak/physical/20141221 has been removed. The directory /log/hotbak/physical/20141224 has been removed. The directory /log/hotbak/physical/20141228 has been removed. The directory /log/hotbak/physical/20141231 has been removed. The directory /log/hotbak/physical/20150104 has been removed. The directory /log/hotbak/physical/20150107 has been removed. The directory /log/hotbak/physical/20150111 has been removed. The directory /log/hotbak/physical/20150114 has been removed. The directory /log/hotbak/physical/20150121 has been removed.  [root@SZDB ~]# ls /log/hotbak/physical 20150125 20150128