sh4.sh

几个linux试验的脚本编程

if [ -s $1 ]
then
dx=`ls -l $1 | awk '{print $5}'`
if [ $dx/1024>4 ]
then
mydate=`date +%d%m`

if [ -f $mydate ]
then
rm -f $mydate
fi
if [ -f ${mydate}bak ]
then
rm -f ${mydate}bak
fi

touch $mydate
#co=0
while read line1
do
case $line1 in
\#*) ;;
*) echo $line1>>${mydate}bak
;;
esac
#((co=$co+1))
#if [ $co -gt 40 ]
#then
#break
#fi
done < $1
tail -n 40 ${mydate}bak>$mydate
chmod 400 $mydate
rm -f $1
touch $1
fi
else
echo "$1 is a empty file or error filename!"
fi