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    <p>The following <code>checklink.cmd</code> program is a good place to start. It relies on the fact that you can do a single-shot ping and that, if successful, the output will contain the line:</p> <pre><code>Packets: Sent = 1, Received = 1, Lost = 0 (0% loss), </code></pre> <p>By extracting tokens 5 and 7 and checking they're respectively <code>"Received"</code> and <code>"1,"</code>, you can detect the success.</p> <pre><code>@setlocal enableextensions enabledelayedexpansion @echo off set ipaddr=%1 :loop set state=down for /f "tokens=5,6,7" %%a in ('ping -n 1 !ipaddr!') do ( if "x%%b"=="xunreachable." goto :endloop if "x%%a"=="xReceived" if "x%%c"=="x1," set state=up ) :endloop echo.Link is !state! ping -n 6 127.0.0.1 &gt;nul: 2&gt;nul: goto :loop endlocal </code></pre> <p>Call it with the name (or IP address) you want to test:</p> <pre><code>checklink 127.0.0.1 checklink localhost checklink nosuchaddress </code></pre> <p>Take into account that, if your locale is not English, you must replace <code>Received</code> with the corresponding keyword in your locale, for example <code>recibidos</code> for Spanish. Do a test ping to discover what keyword is used in your locale.</p> <hr> <p>To only notify you when the state <em>changes</em>, you can use:</p> <pre><code>@setlocal enableextensions enabledelayedexpansion @echo off set ipaddr=%1 set oldstate=neither :loop set state=down for /f "tokens=5,7" %%a in ('ping -n 1 !ipaddr!') do ( if "x%%a"=="xReceived" if "x%%b"=="x1," set state=up ) if not !state!==!oldstate! ( echo.Link is !state! set oldstate=!state! ) ping -n 2 127.0.0.1 &gt;nul: 2&gt;nul: goto :loop endlocal </code></pre> <hr> <p>However, as Gabe points out in a comment, you can just use <code>ERRORLEVEL</code> so the equivalent of that second script above becomes:</p> <pre><code>@setlocal enableextensions enabledelayedexpansion @echo off set ipaddr=%1 set oldstate=neither :loop set state=up ping -n 1 !ipaddr! &gt;nul: 2&gt;nul: if not !errorlevel!==0 set state=down if not !state!==!oldstate! ( echo.Link is !state! set oldstate=!state! ) ping -n 2 127.0.0.1 &gt;nul: 2&gt;nul: goto :loop endlocal </code></pre>
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    1. POHow to check if ping responded or not in a batch file
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    1. COThank you v much @paxdiablo! Can you please help me modify this so that I can only see a message box poping when the server gets up? The command for showing message box is `msg "%username%" Link is up` and this command works for me on Windows 7.
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    2. COThat's a lot of work you do instead of just checking `%ERRORLEVEL%`!
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    3. COThat's a good point, @Gabe, I've incorporated that into the script.
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