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POHow to use Windows CMD pipe( | ) feature with CALL :Label command option?
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copied!<p>I have a frustrating problem when I want to use the pipe(<strong>|</strong>) feature with the Window's CMD shell's <strong>CALL :Label</strong> option. I have a very small example (below): <strong>call-test</strong>.cmd and sample output.</p> <p>The nub of the issue was/is to pipe the output of a CMD script to another program, for example the <strong>tee</strong> utility, or <strong>find</strong> command. For example:</p> <pre><code> @call :Label-02 param | tee call-test.log </code></pre> <p>Which would start the current command file at the label <strong>Label-02</strong> and pipe the output to <strong>tee</strong>. Unfortunately using the pipe character(|) on the line with "call :label" option gives an error:</p> <pre><code>Invalid attempt to call batch label outside of batch script. </code></pre> <p>Whereas, "<strong>call example.cmd</strong> | tee example.log", works just fine.</p> <p>The other IO redirection <strong>></strong> works OK. It is just the one case when "<strong>call :label pipe(|)</strong>" is used that fails. To me it just looks like a windows bug.</p> <p>Does anyone have a workaround and/or know of an explanation? </p> <p>Thanks, Will</p> <hr> <ul> <li><p><strong>call-test output</strong></p> <pre><code>c:\> call-test [start] label 03 :: p1 Invalid attempt to call batch label outside of batch script. Invalid attempt to call batch label outside of batch script. [done] Press any key to continue . . . </code></pre></li> <li><p><strong>call-test</strong></p> <pre><code>@echo off @rem call-test.cmd @rem _________________________________________________ @rem Test :label call option for .cmd files. @rem @echo ^ [start] @call :Label-03 p1 @call :Label-02 second | find " " @call :Label-02 second | tee call-test.log @goto Done @rem _________________________________________________ :Label-01 @echo ^ label 01 :: %1 @goto Exit @rem _________________________________________________ :Label-02 @echo ^ label 02 :: %1 @goto Exit @rem _________________________________________________ :Label-03 @echo ^ label 03 :: %1 @goto Exit @rem _________________________________________________ :Done @echo ^ [done] @pause @rem _________________________________________________ :Exit @exit /b </code></pre></li> </ul>

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