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POshellscript, download tg and pipeline stdout to tar, get http header in stderr?
 

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  1. POshellscript, download tg and pipeline stdout to tar, get http header in stderr?
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    <p>The shellscript I am trying to write is to</p> <ol> <li>download a tarball and stdout to <code>tar</code> to uncompress it</li> <li>at the same time parse the http headers found at stderr</li> <li>set the parsed result at #2 to a variable.</li> </ol> <p>For #1:</p> <pre><code>$ wget -Sq -O- "https://api.github.com/repos/est/est/tarball/master" | tar -zmxf - </code></pre> <p>I enabled the <code>-S</code> option, which shows server response to stderr, I want to parse the header a bit for the string commit hash , and set it to a variable called <code>$rev</code></p> <pre><code>$ rev=$(wget -Sq -O /dev/null "https://api.github.com/repos/est/est/tarball/master" 2&gt;&amp;1 | grep "Content-Disposition:" | tail -1 | awk 'match($0, /filename=.+\-([a-zA-Z0-9]+)\./, f){ print f[1] }') $ echo $rev dacd56e </code></pre> <p>So basically, I want a shellscript that could</p> <ol> <li>pipe stdout to a command, also pipe stderr to another command</li> <li>parse the stderr and set the output as a variable</li> <li>do not create temporary files</li> </ol> <p>For #1 <a href="https://stackoverflow.com/a/9217228/41948">https://stackoverflow.com/a/9217228/41948</a></p> <p>For #2 I found <a href="https://stackoverflow.com/questions/374687/">the answer</a> is the <code>read</code> command, but unfortunately the variable can be only found at a subshell.</p> <p>So how do I pass the variable found at <code>read</code> command subshell to the parent shell?</p> <p>Or how do I write a shellscript like this?</p>
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