bash 发送modem AT命令和解析结果
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/29852742/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Sending modem AT command and parsing result
提问by ogs
I would like to send ATcommand to my modem by using shell script and parse the result in order to verify if the OK is returned.
我想AT使用 shell 脚本向我的调制解调器发送命令并解析结果以验证是否返回 OK。
at=`echo -ne "AT+CFUN1=1\r\n" > /dev/ttyUSB0 | cat /dev/ttyUSB0`
What is the best way to parse the at1 variable and extract "OK" or "ERROR" otherwise ?
解析 at1 变量并以其他方式提取“OK”或“ERROR”的最佳方法是什么？
回答by hlovdal
It is absolutely possible to send AT commands to a modem and capture its output from the command line like you are trying to do, however notby just using plain bash shell scripting. Which is why I wrote the program atinoutspecifically to support scenarios like you ask about.
绝对有可能将 AT 命令发送到调制解调器并像您尝试的那样从命令行捕获其输出，但不能仅使用普通的 bash shell 脚本。这就是为什么我专门编写了atinout程序来支持您所询问的场景。
Test like the following:
测试如下：
MODEM_DEVICE=/dev/ttyUSB0
MODEM_OUTPUT=`echo AT | atinout - $MODEM_DEVICE -`
case $MODEM_OUTPUT
in
*OK*)
echo "Hurray, modem is up and running :)"
;;
*)
echo "Oh no! Something is not working :("
;;
esac
If you intend to parse the output in any more sophisticated way you should save the output to a file instead by giving a filename instead of the last -and read that.
如果您打算以任何更复杂的方式解析输出，您应该将输出保存到一个文件中，而不是通过提供文件名而不是最后一个-并读取该文件名。
回答by Robin Dinse
I was unable to communicate with my Huawei E3372h-158 with @hlovdal's solution, so I rolled my own using expectand screen, in this case for reading the temperature sensors via ^CHIPTEMP?:
我无法使用@hlovdal 的解决方案与我的华为 E3372h-158 通信，所以我自己使用expectand screen，在这种情况下通过以下方式读取温度传感器^CHIPTEMP?：
output=$(sudo expect <<EOF
set timeout 5
log_user 0 spawn sudo screen /dev/ttyUSB0-
sleep 1
send "AT\x5ECHIPTEMP?\r"
expect "OK"
puts "\n-->$expect_out(buffer)<--"
# Send C-a \ to end the session
send "\x01"
send "\x5C"
EOF
)
# Strip non-printable control characters
output=$(printf "$output" | tr -dc '[:print:]\n' )
printf "$output\n" | grep -P "^\^CHIPTEMP"
Hints and caveats: Set log_user 1to get the output of screen. Not sure screenworks in all cases as it produces some non-printing characters and perhaps repeating output.
提示和警告：设置log_user 1为获取screen. 不确定screen在所有情况下都有效，因为它会产生一些非打印字符并且可能会重复输出。
