信号捕捉

trap 信号捕捉

trap用法：trap 'echo ' signal

/bin/bash

trap 'echo "haha  I am still here"' INT

read A

当按下ctrl+c的时候会出现脚本的定义输出的信息

2、

trap 'echo "quit the script";exit 1' INT

read A

捕捉信号后输出echo quit..然后退出

赋值，当捕捉到信号时清楚赋值的内容

/bin/bash

var1=3

var2=4

trap 'unset var1 var2;echo "haha  I am still here"' INT

read A

创建文件夹，当捕捉到信号删除创建的文件夹,然后输出信息

/bin/bash

touch /tmp/traptest

trap 'rm /tmp/traptest &>/dev/null;echo 

"haha  I am still here"' INT

read A

调用函数，捕捉信号

/bin/bash

touch /tmp/traptest

mytrap() {

rm -rvf /tmp/traptest &>/dev/null

echo "quid the script..."

exit 1

trap 'mytrap' INT

read A

捕捉ping

/bin/bash

trap ‘echo "Quit..."; exit 1' SIG

for i in {1..254};do

ping -c1 -W1 192.168.0.$i &>/dev/null

[ $? -eq 0 ] echo "this station is online" || echo "this is offline"

done

执行脚本，当按下ctrl+c ping就立即结束！