In a batch file I need to check whether my machine is connected to the Internet. What I'm using is to ping a website, save the result as text, then search it for a specified string. I don't know how to use errorlevel?
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中国DOS联盟论坛 » DOS疑难解答 & 问题讨论 （解答室） » How can I use a return value from one parameter to verify whether my network is connected?
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Posted 2003-07-02 00:00 · 中国 河南 郑州 联通
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Posted 2003-07-02 00:00 · 中国 广东 广州 增城区 电信
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Just use PING. If the PING succeeds, errorlevel is 0; if it fails, then it is 1. Written as a batch file:
@echo off
echo Please wait . . .
ping www.163.com >nul
if errorlevel 0 echo yes
if errorlevel 1 echo no
@echo off
echo Please wait . . .
ping www.163.com >nul
if errorlevel 0 echo yes
if errorlevel 1 echo no
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Posted 2003-07-02 00:00 · 中国 河南 郑州 联通
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So that's how it is, many thanks. I only knew the textbook said every command returns an erroelevel value, but I just didn't understand what it meant. In the future, if I have questions about batch files, I hope the moderator won't hesitate to give guidance.
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Posted 2003-07-03 00:00 · 中国 广东 广州 增城区 电信
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Sure, let's all learn together!
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Posted 2003-07-03 00:00 · 美国 肯塔基州 费耶特县 列克星敦 Charter_Communications
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if errorlevel 0 echo yes
if errorlevel 1 echo no
It should be changed to this, right:
if not errorlevel 1 echo yes
if errorlevel 1 echo no
if errorlevel 1 echo no
It should be changed to this, right:
if not errorlevel 1 echo yes
if errorlevel 1 echo no
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Posted 2003-07-03 00:00 · 中国 北京 科技网
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What exactly is the difference?
if not errorlevel 0 echo no
if errorlevel 0 echo yes
Would that work?
if not errorlevel 0 echo no
if errorlevel 0 echo yes
Would that work?
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Posted 2003-07-03 00:00 · 中国 河南 南阳 联通
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Yes, after handling it that way, it seems in both cases it’s true. Can eq be used?
Also, what does the >nul after ping mean? Is it assigning to a value or creating a file?
Let me ask a few more questions at the same time, please help me sort them out:
1。How can I make a loop based on time, for example running once every minute? Can I jump out of the loop like break?
2。Can batch files recurse?
3。When do I need to use an escape character? Which symbol is it?
Also, what does the >nul after ping mean? Is it assigning to a value or creating a file?
Let me ask a few more questions at the same time, please help me sort them out:
1。How can I make a loop based on time, for example running once every minute? Can I jump out of the loop like break?
2。Can batch files recurse?
3。When do I need to use an escape character? Which symbol is it?
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Posted 2003-07-11 00:00 · 中国 广东 广州 电信
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The >nul after ping makes the text prompts produced after executing ping not display on the screen;
wanting to make a time-based loop may be a bit more complicated, but you can try CountDown, a tool used to run a program within a specified period of time (mainly used in batch files). Could you explain the second and third questions a bit more clearly?
wanting to make a time-based loop may be a bit more complicated, but you can try CountDown, a tool used to run a program within a specified period of time (mainly used in batch files). Could you explain the second and third questions a bit more clearly?
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Posted 2003-07-11 00:00 · 中国 湖北 武汉 硚口区 电信
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Impressive...
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Posted 2003-07-11 00:00 · 中国 河南 郑州 联通
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Isn't >nul something that's in the shell under linux? It works here too, huh
As for the second question, I mean whether a.bat can contain a call a.bat statement?
The third question is, if I want to use quotation marks inside quotation marks, or if I want to cancel the effect of a wildcard, how can I do it? For example
"he said: "..." " and wanting to find files ending with * .
As for the second question, I mean whether a.bat can contain a call a.bat statement?
The third question is, if I want to use quotation marks inside quotation marks, or if I want to cancel the effect of a wildcard, how can I do it? For example
"he said: "..." " and wanting to find files ending with * .
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Posted 2003-07-13 00:00 · 中国 广东 广州 增城区 电信
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欢迎大家观临我的个人主页：
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EMAIL: lydong@china.com.cn lydong@yeah.net
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EMAIL: lydong@china.com.cn lydong@yeah.net
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Posted 2003-07-14 00:00 · 中国 河南 郑州 联通
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Got it.
By the way, one off-topic question: are you an alumnus of Zhengzhou University? I originally came to this site from a recommendation in Computer News, and when I found that it was actually on a Zhengzhou University server, I was really quite pleased.
By the way, one off-topic question: are you an alumnus of Zhengzhou University? I originally came to this site from a recommendation in Computer News, and when I found that it was actually on a Zhengzhou University server, I was really quite pleased.
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