脚本之trap命令处理信号

代码：
[root@localhost shell]# cat signal_catch.sh 
#!/bin/bash
#
net=122.207.210
FILE=`mktemp  /media/test.XXXXXX`
clear() {
        echo "quit........"
        exit 1
}
trap 'clear' INT

for i in {9..16}
do
   if ping -c 1 -W 1 $net.$i &> /dev/null
   then
        echo "$net.$i is up....." |tee >> $FILE
   else
        echo "$net.$i is down..." 
   fi
done

结果：
[root@localhost shell]# ./signal_catch.sh 
122.207.210.9 is down...
122.207.210.10 is down...
122.207.210.11 is down...
122.207.210.13 is down...
122.207.210.14 is down...
^Cquit........
此时/media/test.XXXXXX文件内容（只有一台主机在线.....）
[root@localhost media]# ll
total 4
-rw------- 1 root root 26 Jul 23 04:49 test.R15GTV
[root@localhost media]# cat test.R15GTV 
122.207.210.12 is up.....

这时我们虽然终止了脚本的进行，但是临时文件还在，可以改一下脚本使得在脚本退出时删除临时文件
此时/media目录下没有任何文件
[root@localhost media]# ll
total 0
[root@localhost media]#
代码：
[root@localhost shell]# cat signal_catch.sh 
#!/bin/bash
#
net=122.207.210
FILE=`mktemp  /media/test.XXXXXX`
clear() {
        echo "quit........"
        rm -rf $FILE            #想让脚退出时执行哪些命令都可以写在这个函数中
        exit 1
}
trap 'clear' INT

for i in {9..16}
do
   if ping -c 1 -W 1 $net.$i &> /dev/null
   then
        echo "$net.$i is up....." |tee >> $FILE
   else
        echo "$net.$i is down..." 
   fi
done
结果：
[root@localhost shell]# ./signal_catch.sh 
122.207.210.9 is down...
122.207.210.10 is down...
122.207.210.11 is down...
122.207.210.13 is down...
^Cquit........
此时/media目录下
[root@localhost media]# ll
total 0
[root@localhost media]#