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    <p>As the accepted answer already pointed out, you can't use neither the <code>zip</code> nor the <code>jar</code> command to insert a <strong>specific file</strong> on the file system to a specific directory inside the compressed file.</p> <p>But there is this <strong>workaround</strong>, which in a nutshell extracts a specific file inside the compressed file first, you can update it and then put it back into the compressed file:</p> <p><strong>1. Extracting a single file :</strong> <br/> Consider a jar with the following contents </p> <pre><code>$ jar tvf foo.jar 0 Thu Jan 10 00:05:06 IST 2013 META-INF/ 68 Thu Jan 10 00:05:06 IST 2013 META-INF/MANIFEST.MF 0 Thu Jan 10 00:04:30 IST 2013 x/ 0 Thu Jan 10 00:07:36 IST 2013 x/b/ 9 Thu Jan 10 00:07:36 IST 2013 x/b/hello.txt 0 Thu Jan 10 00:04:30 IST 2013 x/a/ </code></pre> <p>To extract only hello.txt, you have to give fully qualified path of the file-to-extract. Jar creates appropriate folders too.</p> <p><em>Example :</em> </p> <pre><code>$ jar xvf foo.jar x/b/hello.txt inflated: x/b/hello.txt $ tree x/ x └── b └── hello.txt 1 directory, 1 file </code></pre> <p><strong>2. Updating a Single File</strong></p> <ol> <li>Modify the extracted file</li> <li>update the jar using the 'u' flag. Provide the exploded directory root and jar shall update all the path elements under it.</li> </ol> <p><em>Example:</em></p> <pre><code>$ jar vfu foo.jar x/ adding: x/(in = 0) (out= 0)(stored 0%) adding: x/b/(in = 0) (out= 0)(stored 0%) adding: x/b/hello.txt(in = 23) (out= 11)(deflated 52%) </code></pre> <p><strong>3. Which version of jar I tried this out with ?</strong></p> <p>I used <code>jar</code> bundled with JDK 7 on Fedora 17.</p> <hr/> <p>I have verified all the steps mentioned here. Hope this helps.</p>
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    1. COWell, this is definitely a good answer, although I was not looking for a workaround like I said above. It could work for sure, even in a batch script, however the reason I started the bounty is to get a definitive answer on whether it's possible or not. Now I know it's not, and then workarounds are the only choice. In any case, I appreciate the solution, as it's one of the most straight forward I would say.
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