日志文件清理代码

对于产生大量日志的服务器，要对日志进行控制，如果任由日志膨胀可能会写满磁盘造成服务器宕机。

要提的是代码中几个值得注意的地方：

命令	说明
date_now=`date +"%Y-%m-%d"`	通过``符号将命令执行结果赋给变量
if ! [ -e ${clean_log_path} ]	中括号里外与其他内容都要有空格
delete_log_file(){	函数定义{符号一定要紧接不能写到下一行
${delete_log_prefix}${date_yes}	字符串连接直接写不用任何连接符
${array_path[*]}	直接写$array_path[*]会识别为$array_path不能成功遍历数组；凡变量鼓励都用定界符{}
delete_log_file	函数的定义要在使用之前，不然会提示找不到函数

 另外要注意Windows编缉的shell脚本会因回车换行问题致使执行时一直报错，参看“Windows与Linux的回车换行转换”

#code by ls in 20170427
date_now=`date +"%Y-%m-%d"`
date_yes=`date -d "1 day ago" +"%Y-%m-%d"`
#the drectory of this script,need to change for yourself
clean_log_path="/iom_jk/IOM_INF/tomcat_6.0.44_1/clean_log/"
if ! [ -e ${clean_log_path} ]
then
    mkdir -p $clean_log_path
fi
clean_log_file="${clean_log_path}clean_log.log" #the logfile of this script,need to change for yourself
delete_log_prefix="log.log."            #the prefix of delete file,need to change for yourself
zero_log_postfix=".log"                        #the postfix of zero file,neet to change for yourself
#those drectory that need to clean,neet to change for yourself
array_path[0]="/iom_jk/IOM_INF/tomcat_6.0.44_1/webapps/IomInterface/WEB-INF/sh/logs"
array_path[1]="/iom_jk/IOM_INF/tomcat_6.0.44_1/bin/logs"
array_path[2]="/iom_jk/app/interface/IomInterface/WEB-INF/sh/logs"

delete_log_file(){            #the function to delete yesterday log file,do not need to change in general
    if [ -e ${delete_log_prefix}${date_yes} ]
    then
        rm -f ${delete_log_prefix}${date_yes} && echo "${data_now} : ${delete_log_prefix}${date_yes} have been delete" >> ${clean_log_file}
    fi
}

zero_log_file(){       #the function to zero log file,do not need to change in general
    for file_name in `ls *${zero_log_postfix}`
    do
        echo "" > ${file_name} && echo "${data_now} : ${file_name} have been clean" >> ${clean_log_file}
    done
}

for path_log in ${array_path[*]}
do
    cd $path_log
    echo "$date_now : enter ${path_log}" >> ${clean_log_file}
    delete_log_file                            #the function to delete yesterday log file,need to change for yourself
    zero_log_file                                #the function to zero log file,need to change for yourself
    echo "" >> ${clean_log_file}
done