Extracting .jar file with command line
To extract the files from a jar file, use x , as in:
To extract only certain files from a jar file, supply their filenames:
C:\Java> jar xf myFile.jar foo bar The folder where jar is probably isn’t C:\Java for you, on my Windows partition it’s:
C:\Program Files (x86)\Java\jdk[some_version_here]\bin Unless the location of jar is in your path environment variable, you’ll have to specify the full path/run the program from inside the folder.
EDIT: Here’s another article, specifically focussed on extracting JARs: http://docs.oracle.com/javase/tutorial/deployment/jar/unpack.html
Ok, When I do that jar xf. command, I get the error: ‘jar’ is not recognized as an internal or external command,operable program or batch file. How do I fix this?
java.io.IOException: META-INF : could not create directory at sun.tools.jar.Main.extractFile(Main.java:928) at sun.tools.jar.Main.extract(Main.java:852) at sun.tools.jar.Main.run(Main.java:242) at sun.tools.jar.Main.main(Main.java:1149) how to remove this error?
@AnilPatel I fixed this by running the command prompt as administrator (right click «run as administrator»)
here’s a stupid question — if I do this right (fixed the error messages I received first time), where are these files going to be extracted to? I’ve checked the jdk folder and the folder of the jar file to extract but I don’t see any new files
Note that a jar file is a Zip file, and any Zip tool (such as 7-Zip) can look inside the jar.
unzip file.jar -d dir_name_where_extracting
You can use the following command: jar xf rt.jar
Where X stands for extraction and the f would be any options that indicate that the JAR file from which files are to be extracted is specified on the command line, rather than through stdin.
Java has a class specifically for zip files and one even more specifically for Jar Files.
java.util.jar.JarOutputStream java.util.jar.JarInputStream using those you could, on a command from the console, using a scanner set to system.in
Scanner console = new Scanner(System.in); String input = console.nextLine(); then get all the components and write them as a file.
JarEntry JE = null; while((JE = getNextJarEntry()) != null) < //do stuff with JE >You can also use java.util.zip.ZipInputStream instead, as seeing a JAR file is in the same format as a ZIP file, ZipInputStream will be able to handle the Jar file, in fact JarInputStream actually extends ZipInputStream.
an alternative is also instead of getNextJarEntry, to use getNextEntry
Are there other options to unzip a file in Ubuntu besides «unzip»? [closed]
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My sysadmin is unreachable right now, and I have a zipped file on the server that I would like to unzip. however, we don’t currently have zip and unzip installed, and I don’t have root access to install them. Am I out of options entirely? Are there other things that can unzip this file?
6 Answers 6
I haven’t tried this, but, there’s a zipfile module in Python’s standard library since version 1.6, and since version 2.6 has had an extractall method
You should be able to do something like:
- Create a file with the following contents (editing it to fit your use case).
- Save the file as «unzipfile.py»
- Run with python unzipfile.py
And it’ll extract test.zip to /home/user/directory .
import zipfile with zipfile.ZipFile('test.zip', "r") as z: z.extractall("/home/user/directory") Alternatively, BusyBox contains an unzip «module», and if you could download and run the statically-linked BusyBox, then you could use that to unzip things.
i tried the first part of this and got: The program ‘import’ can be found in the following packages: * imagemagick * graphicsmagick-imagemagick-compat — btw. i didn’t downvote you
You can now just call the module directly from the command line python -m zipfile -e monty.zip target-dir/ (see docs.python.org/2/library/zipfile.html#command-line-interface)
If you have java installed, the jar command can unzip a zipped file:
Update: OpenJDK is downloadable for Linux as a tar.gz archive installable without root access here: http://jdk.java.net/17/
The Windows version is however a zip file so that wouldn’t help on that OS.
The program ‘jar’ can be found in the following packages: * default-jdk * fastjar * gcj-4.6-jdk * openjdk-6-jdk * gcj-4.5-jdk * openjdk-7-jdk Ask your administrator to install one of them 🙁
I am a little scerred to install anything on the server, for fear of the wrath of my sysadmin, but i will definitely try this if need be.
BSD / Mac OSX
The tar utility that ships with Mac and BSD derivatives, support extracting zip archives from the tar command
tar -xvf foo.zip tar --version bsdtar 2.8.3 - libarchive 2.8.3 Debian / RHEL
The tar archive that ships with Ubuntu and others does not support extracting zip files. The best option will be to scp the file to a machine with zip installed.
tar -xvf foo.zip tar: This does not look like a tar archive tar: Exiting with failure status due to previous errors echo "the quick brown fox jumped over the lazy dog" > bar.txt zip -r bar.zip bar.txt rm bar.txt tar -xvf bar.txt cat bar.txt the quick brown fox jumped over the lazy dog Rewrote answer to clarify that tar -xvf only works on bsd OS’s. While it is good information, It will not work in this scenario after all.
Linux: what is a most convenient way to see the content of .jar file
What is a most convenient way to see the content of .jar file w/o using unzip/untar commands? What I’d like to do — is to browsing inside using cd command like it is the usual folder, seeing content, size of classes — ‘ls -la’ . MC allowed to do so on the fly. Is there are any ease-in-use alternative?
@ekaj less and unzip doesnt help me — it doesn’t show me the size of files in the archive for example, or date&time of last modification (unless I’ll decompress it somewhere to /tmp/AAA and then will run ls -la against /tmp/AAA — which is what I want to avoid).
@javagirl: unzip -l does show you the size of files in the archive and date & time of last modification without unpacking the package. See my answer below. Actually, this is a duplicate as ekaj suggested.
8 Answers 8
Use the jar tool that comes with the Java SDK for listing contents of a jar file. As described in http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jar.html
Use vim to view and edit the contents of a jar file without extracting:
Open the jar in vim like this:
You are presented with a list of files:
1 " zip.vim version v22 2 " Browsing zipfile /var/www/sandbox/eric/rabbitmq-client.jar 3 " Select a file with cursor and press ENTER 4 5 META-INF/ 6 META-INF/MANIFEST.MF 7 com/ 8 com/rabbitmq/ 9 com/rabbitmq/client/ 10 com/rabbitmq/client/impl/ 11 com/rabbitmq/client/impl/recovery/ 12 com/rabbitmq/tools/ 13 com/rabbitmq/tools/json/ 14 com/rabbitmq/tools/jsonrpc/ 15 com/rabbitmq/utility/ Put the cursor over the META-INF/MANIFEST.MF and press Enter . You see this:
Manifest-Version: 1.0 Ant-Version: Apache Ant 1.8.2 Created-By: 1.6.0_31-b31 (Sun Microsystems Inc.) Export-Package: com.rabbitmq.client;version="3.3.5";uses:="com.rabbitm q.client.impl,com.rabbitmq.utility,javax.net,javax.net.ssl,javax.secu rity.auth.callback,javax.security.sasl",com.rabbitmq.client.impl;vers ion="3.3.5";uses:="com.rabbitmq.client,com.rabbitmq.utility,javax.net ",com.rabbitmq.client.impl.recovery;version="3.3.5";uses:="com.rabbit mq.client,com.rabbitmq.client.impl",com.rabbitmq.tools;version="3.3.5 ";uses:="com.rabbitmq.utility",com.rabbitmq.tools.json;version="3.3.5 ",com.rabbitmq.tools.jsonrpc;version="3.3.5";uses:="com.rabbitmq.clie nt",com.rabbitmq.utility;version="3.3.5" Bundle-Vendor: SpringSource Bundle-Version: 3.3.5 Tool: Bundlor 1.0.0.RELEASE Bundle-Name: RabbitMQ Java AMQP client library Bundle-ManifestVersion: 2 Bundle-SymbolicName: com.rabbitmq.client Import-Package: javax.net;version="0",javax.net.ssl;version="0",javax. security.auth.callback;version="0",javax.security.sasl;version="0" Name: rabbitmq-client Specification-Title: AMQP Specification-Version: 0.9.1 Specification-Vendor: AMQP Working Group (www.amqp.org) Implementation-Title: RabbitMQ Implementation-Version: 3.3.5 Implementation-Vendor: Rabbit Technologies Ltd. (www.rabbitmq.com) Change a few lines using normal vim editing commands.
press 'i' to enter insert mode edit your lines press :wq to write and quit You are taken back to a list of files in the jar, quit out.
Check to see if it the changes are permanent:
Follow the above steps again to inspect the file again, the change should still be there.