?????? 本文是我的一個學生在運維工作中寫的自動日志清理腳本程序，我這里不評價該shell腳本寫的好與壞，只是發出來，和大家做一個分享，如果能給大家帶來一點點思路上的參考就夠了。

自動日志清理腳本程序

#!/bin/sh
##########################################################
#created by ydds????? #
#date 2011-4-25?????? #
#function log clear default save 7 days logs?? #
#when hard disk space achieve 80%, automatic save 3 days #
#when hard disk space achieve 90%,save only LOG today ? #
#when only today log hard disk space achieve >95%? #
#?? clear today log????? #
##########################################################
set -x

oldboyWarnValue=80
oldboyCriticalValue=90
oldboyCC=95
nohupFlag=0

# $1 must be directory
if [ $# -ne 2 ]||[? -z $1 ]||[ ! -d $1 ];then
??????? echo "Uage:logClear /home/oldboy/apachelogs /dev/xvda1"
?exit 1
fi

#clear log path
logPath=$1

devstr=$(df|awk '/\//{print $1}'|sed -n '/\//p')
echo "${devstr}"|grep -q "$2"
[ $? -ne 0 ]&&exit 1

# hard disk name
oldboyName=$2

scriptLog=/server/script/clearLog.log

#clear nohuplog
clearNohupLog()
{
?if [ ${nohupFlag} -ne 1 ];then
? ?# check nulup.log >1G clear
??????? ?fileNohupLog="${logPath}/../nohup.log"
??????? ?NohupSize=$(du ${fileNohupLog}|awk '{print $1/1024/1024}'|awk -F "." '{print $1}')
??echo "check nohup.log size: $(du -h ${fileNohupLog}|awk '{print $1}')">>${scriptLog}
??????? ?if [ -f ${fileNohupLog} ];then
??????????????? ?if [ ${NohupSize} -ge 1 ]||[ $1 -eq 1 ];then
??????????????????????? ?echo "">${fileNohupLog}
????if [ $? -eq 0 ];then
?????echo "clear nohup.log ok!">>${scriptLog}
????fi?
??????????????? ?fi
??????? ?fi
?fi
}

#hard disk used
oldboyUsed=$(/bin/df ${oldboyName}|tail -1|awk '{print $5}'|awk -F "%" '{print $1}')

echo "[$(date +%Y-%m-%d\ %H:%M:%S)]check hard disk used start....">>${scriptLog}
echo "check current hard disk space used ${oldboyUsed}%">>${scriptLog}

#clear nohup.log >warning
if [ ${oldboyUsed} -ge ${oldboyWarnValue} ];then
?echo "hard disk used ${oldboyUsed}% > ${oldboyWarnValue}%,start clear nohup.log..">>${scriptLog}
?clearNohupLog 1
?nohupFlag=1
fi

if [ ${nohupFlag} -eq 1 ];then
?#hard disk used
?echo "after deal nohup.log ,check hard disk again...">>${scriptLog}
?oldboyUsed=$(/bin/df ${oldboyName}|tail -1|awk '{print $5}'|awk -F "%" '{print $1}')
fi

#save 7,3 days logs
clearnDayLogs()
{
?# cd tmp directory
?cd /tmp

?if [ $1 -ne 1 ];then
??if [ -d ${logPath} ];then
???cd ${logPath}
???find . -type f -mtime +$1 |xargs rm -f
???
???if [ $? -eq 0 ];then
??????????????????????? ?echo " clear ${logPath} logs $1 ago days logs successfully!">>${scriptLog}
??????????????? ?else
??????????????????????? ?echo " clear ${logPath} logs $1 ago days logs fail!">>${scriptLog}
??????????????? ?fi?
??fi
?else
??#clear nohup.log
??????? ?clearNohupLog 1

??clearFileNameArr=($(ls ${logPath}|awk -F "." 'NF==3{print $0}'))
??# clear file name is not blank
??if [ -n "${clearFileNameArr}" ];then
???echo "|">>${scriptLog}
???for((i=0;i<${#clearFileNameArr[@]};i++))
??????? ??do
????if [ ${i} -eq 0 ];then
?????echo "clear file------------------start--------------------------->">>${scriptLog}
????fi
????
????# cd? this directory
??????????????? ??cd ${logPath}
????if [ -f "${logPath}/${clearFileNameArr[$i]}" ];then
??????????????? ???find . -type f -name ${clearFileNameArr[$i]} |xargs rm -f
????fi

????if [ $? -eq 0 ];then
?????echo "${clearFileNameArr[$i]}">>${scriptLog}
????fi
??????? ??done
???echo "clear file------------------------- end -------------------->">>${scriptLog}
???echo "|">>${scriptLog}
??else
???echo "☆☆☆☆☆☆ Not files 1 day ago ☆☆☆☆☆☆">>${scriptLog}
??fi
??afterClearoldboyUsed=$(/bin/df ${oldboyName}|tail -1|awk '{print $5}'|awk -F "%" '{print $1}')
??echo "clear ${logPath} logs ${1} ago days logs successfully!">>${scriptLog}
?fi
}

?

?如果你把握不好該腳本帶來的誤刪除的風險，請慎用。

#when today log save ,check hard disk used >80%,so? clear today logs
clearTodayLog()
{
?oldboyUsedTmp=$(/bin/df ${oldboyName}|tail -1|awk '{print $5}'|awk -F "%" '{print $1}')
?echo "clear today log start ...">>${scriptLog}
?#todayFileArr=($(ls ${logPath}))
?todayFileArr=($(find ${logPath} -type f|awk -F "/" '{print $NF}' ))
?echo "start save current logs tail 300 ..">>${scriptLog}
?echo "|">>${scriptLog}
?echo "dealing currnet logs name*********start*************>>>>">>${scriptLog}
?for((i=0;i<${#todayFileArr[@]};i++))
?do
?? cd ${logPath}
????
?? #get tail 300 --> tmp file
?? tail -300 ${todayFileArr[$i]}>/tmp/tmpydds
??
?? #check file exist again save tail 300 --- this file

?? if [ -f "${logPath}/${todayFileArr[$i]}"? ];then
???????? ? find . -type f -name ${todayFileArr[$i]} -exec cat /tmp/tmpydds >${logPath}/${todayFileArr[$i]} \;
??? if [ $? -eq 0 ];then
??? ?echo " ${todayFileArr[$i]}----- ok!">>${scriptLog}
??? else
????echo " ${todayFileArr[$i]}----- fail!">>${scriptLog}
??? fi
?? fi
?done?
?echo "dealing currnet logs name********* end *************>>>>">>${scriptLog}
?echo "|">>${scriptLog}
?if [ $? -eq 0 ];then
? ?echo "clear today log successfully!">>${scriptLog}
??
?else?
??echo "clear today log fail!">>${scriptLog}
?fi
}

wflag=0
cflag=0
flag=0
count=0

#clear nohup.log
#clearNohupLog 0

while true
do
??????? oldboyUsed=$(/bin/df ${oldboyName}|tail -1|awk '{print $5}'|awk -F "%" '{print $1}')
?
?#not first and hard disk < warning value? break
??????? [ ${count} -ne 0 ]&&[ ${oldboyUsed} -lt ${oldboyWarnValue} ]&&break

?count=1
?
################next
??????? if [ ${oldboyUsed} -ge ${oldboyWarnValue} ];then
??case ${cflag} in
??????????????????????? 1)
??????????????????????????????? clearTodayLog
??????????????????????????????? cflag=2
??????????????????????? ;;
??????????????????????? 2)
??????????????????????????????? echo "baojing---------->">>${scriptLog}
??????????????????????????????? break
??????????????????????? ;;
??????????????? esac

??????????????? case ${wflag} in
??????????????????????? 1)
??????????????????????????????? clearnDayLogs 1
??????????????????????????????? wflag=2
??????????????????????? ;;
??????????????????????? 2)
??????????????????????????????? clearTodayLog
??????????????????????????????? wflag=3
??????????????????????? ;;
??????????????????????? 3)
????echo "baojing---------->">>${scriptLog}
??????????????????????????????? break
??????????????????????? ;;
??????????????? esac?
??????? fi

######################first
??????? if [ ${wflag} -eq 0 ]&&[ ${cflag} -eq 0 ];then

??#when >95% clear today
??if [ ${oldboyUsed} -ge ${oldboyCC} ];then

???#clear 1 ago log
???clearnDayLogs 1

???#clear today log
???clearTodayLog??
???break??

??????????????? #when hard disk is used 90% is Critical? today log only save
??????????????? elif [ ${oldboyUsed} -ge ${oldboyCriticalValue} ];then
??????????????????????? echo "${oldboyName} current used ${oldboyUsed}%>= ${oldboyCriticalValue}% is Critical!">>${scriptLog}
??????????????????????? cflag=1
??????????????????????? clearnDayLogs 1

??????????????? #when hard disk is used ${oldboyWarnValue}% is Warning automatic save 3 days
??????????????? elif [ ${oldboyUsed} -ge ${oldboyWarnValue} ];then
??????????????????????? echo "${oldboyName} current used ${oldboyUsed}%>= ${oldboyWarnValue}% is Warnning!">>${scriptLog}
??????????????????????? wflag=1
??????????????????????? clearnDayLogs 3

??????????????? #when hard disk is used lt 80% the logs oldboy is normal.
??????????????? else
??????????????????????? echo "${oldboyName} current used ${oldboyUsed}% is Normal!">>${scriptLog}
??????????????????????? clearnDayLogs 7
??????????????????????? break
??????????????? fi
??????? fi

??????? flag=1
done

#when clear all log oldboy used
oldboyUsed=$(/bin/df ${oldboyName}|tail -1|awk '{print $5}'|awk -F "%" '{print $1}')

#after deal log check disk used

if [ ${oldboyUsed} -ge ${oldboyCC} ];then
?echo "oldboy used ${oldboyUsed}% is Critical Critical!">>${scriptLog}

elif [ ${oldboyUsed} -ge ${oldboyCriticalValue} ];then
? echo "oldboy used ${oldboyUsed}% is Critical!">>${scriptLog}

elif [ ${oldboyUsed} -ge ${oldboyWarnValue} ];then
? echo "oldboy used ${oldboyUsed}% is Warning!">>${scriptLog}

else
?echo "oldboy used ${oldboyUsed}% is Normal!"
fi

echo "check hard disk used end!">>${scriptLog}
?

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