소프트웨어 프로그램밍 좀 할줄 아시는분 도움좀요

램드라이브 꽉차면 자동 비우기관련 검색을 하다가

찾은건데요

https://niemand.org/bbs/view.php?id=tip&page=8&sn1=on&divpage=1&sn=on&ss=off&sc=off&keyword=niemand&select_arrange=headnum&desc=asc&no=12&PHPSESSID=a2904bacb7aac60a11def87ca3bccb7f

개인블로그 같은데 여러가지있더라구요

#!/bin/sh
############################
# clear old log file
# programed by niemand
############################

LIMIT=1

while [ 1 ]
do
sleep 3
clear
USAGE=`bdf | grep /user3/weblog | awk '{ print $5 }'`
LEN=`expr length $USAGE`
let LEN=$LEN-1
USAGE=`expr substr $USAGE 1 $LEN`
echo "usage= $USAGE limit= $LIMIT"
if [ $USAGE -gt $LIMIT ]
then
echo "disk full"
#######################
echo "File is too big"
#######################
find /user3/weblog/niemand/sh/ -type f -size +10240c -exec rm {} \;

#######################
echo "File is too old"
#######################
find /user3/weblog/niemand/sh -type f ! -mtime -7 -exec rm {} \;
fi
done

이렇게 써있는데 무슨 말인지...전혀..모르겠네요

조금 수정해서 제가 원하는거 만들수 있을까요?