trap的使用

#!/bin/bash
my_exit()
{
        rm -f temp*
        echo  "delete all tempfile"
        exit 1
}
trap 'my_exit'  2

cat /proc/net/ip_conntrack > temp.$$
echo "" > file
while read line
do
        word=`echo $line|awk '{print $5}' | awk -F= '{print $2}'`
        grep  "${word}" file || echo "`awk '{print $5}' /proc/net/ip_conntrack | grep -o "src=$word" |wc -l ` $word" >>file
done < temp.$$

my_exit