trap的使用

#!/bin/bash
trap 'rm tmp*;echo "all tmp file is deleted !";exit' 2
n=1
while : ; do
        echo creat tmpfile...
        dd if=/dev/zero of=tmp$n bs=1 count=1 2>/dev/null
        ((n++))
        ls tmp*
        sleep 0.5
done

#!/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