2

我的连接不稳定,但是我有一个备份。我制作了一些 bash 脚本来检查连接并在当前连接已死时更改连接。请帮助我改进它们。

这些脚本几乎可以工作,除了没有等待足够长的时间来接收 IP(它循环到直到循环中的下一步太快)。开始:

#!/bin/bash
# Invoke this script with paths to your connection specific scripts, for example
# ./gotnet.sh ./connection.sh ./connection2.sh

until [ -z "$1" ]  # Try different connections until we are online...
    do
    if eval "ping -c 1 google.com"
    then
        echo "we are online!" && break
    else
    $1     # Runs (next) connection-script.
    echo
    fi
     shift
   done

   echo               # Extra line feed.
exit 0

这是从属脚本的示例:

#!/bin/bash
ifconfig wlan0 down
ifconfig wlan0 up
iwconfig wlan0 key 1234567890
iwconfig wlan0 essid example
sleep 1
dhclient -1 -nw wlan0
sleep 3
exit 0
4

3 回答 3

6

这是一种方法:

#!/bin/bash
while true; do
        if ! [ "`ping -c 1 google.com; echo $?`" ]; then #if ping exits nonzero...
                ./connection_script1.sh #run the first script
                sleep 10     #give it a few seconds to complete
        fi
        if ! [ "`ping -c 1 google.com; echo $?`" ]; then #if ping *still* exits nonzero...
                ./connection_script2.sh #run the second script
                sleep 10     #give it a few seconds to complete
        fi
        sleep 300 #check again in five minutes
done

根据您的喜好调整睡眠时间和 ping 计数。此脚本永远不会退出,因此您很可能希望使用以下命令运行它:

./connection_daemon.sh 2>&1 > /dev/null & disown

于 2010-03-29T15:32:34.803 回答
2

您是否尝试过从命令中省略该-nw选项dhclient

此外,eval从您的它们中删除和引号if是不必要的。像这样做:

if ping -c 1 google.com > /dev/null 2>&1
于 2010-03-28T04:08:54.147 回答
0

尝试在某处使用 ConnectTimeout ${timeout}。

于 2010-03-28T02:51:35.663 回答