[root@www tools]# tree tools/
tools/
├── bin
│   ├── del_history_files
│  
└── etc
    ├── del_history_files.cfg

2 directories, 2 files

[root@www tools]# more tools/bin/del_history_files 
#!/bin/sh

# 删除指定目录下，文件时间早于指定时间节点的文件，时间粒度：小时
# 配置文件格式 ：  需清理的目录=小时数
#
#
# define restricted path
PATH="/bin:/usr/bin:/sbin:/usr/sbin"

# adirname - return absolute dirname of given file
adirname() { odir=`pwd`; cd `dirname $1`; pwd; cd "${odir}"; }


# ---------
# constants
# ---------
MYNAM=`basename "$0"`
MYDIR=`adirname "$0"`
MYCFG="${MYDIR}/../etc/${MYNAM}.cfg"
MYTMP="${MYDIR}/../tmp"
MYLCK="${MYTMP}/${MYNAM}.lock"

# perform some locking (as good as it gets in a shell)
[ -s "${MYLCK}" ] && kill -0 `cat "${MYLCK}"` 2>/dev/null &&
        die "${MYNAM}: already running!"
echo "$$" > "${MYLCK}"

PATHS=(`cat ${MYCFG}`)
for PP in ${PATHS[@]}
do
	APP_PATH=`echo ${PP} | awk -F‘=‘ ‘{print $1}‘`
	N=`echo ${PP} | awk -F‘=‘ ‘{print $2}‘`
        if [ -d ${APP_PATH} ] ; then
		T=`/bin/date --date "${N} hours ago" "+%Y%m%d%H%M"`
		TMP_FILE="/tmp/`echo ${PP} | md5sum | awk ‘{print $1}‘`"
		touch -t ${T} ${TMP_FILE}
		find ${APP_PATH} ! -newer ${TMP_FILE} -type f -print0 | xargs -0 -n 100 rm -rf
		find ${APP_PATH} -type d -empty -print0 | xargs -0 -n 100 rm -rf &> /dev/null
        fi
done

rm -rf ${MYLCK}

[root@www tools]# more tools/etc/del_history_files.cfg 
#需清理的目录=小时数
/home/logs/nginx=720
/home/logs/varnish=720

[root@www tools]# more /etc/crontab
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/

#clear old logs
00 6 * * * root /home/tools/bin/del_history_files