Determine Linux Version from Java

Getting Linux Distro from java

This code can help you:

String[] cmd = {
"/bin/sh", "-c", "cat /etc/*-release" };

try {
    Process p = Runtime.getRuntime().exec(cmd);
    BufferedReader bri = new BufferedReader(new InputStreamReader(
            p.getInputStream()));

    String line = "";
    while ((line = bri.readLine()) != null) {
        System.out.println(line);
    }
} catch (IOException e) {

    e.printStackTrace();
}

UPDATE

It if you only need the version try with uname -a

UPDATE

Some linux distros contain the distro version in the /proc/version file. Here is an example to print them all from java without invoking any SO commands

//lists all the files ending with -release in the etc folder
File dir = new File("/etc/");
File fileList[] = new File[0];
if(dir.exists()){
    fileList =  dir.listFiles(new FilenameFilter() {
        public boolean accept(File dir, String filename) {
            return filename.endsWith("-release");
        }
    });
}
//looks for the version file (not all linux distros)
File fileVersion = new File("/proc/version");
if(fileVersion.exists()){
    fileList = Arrays.copyOf(fileList,fileList.length+1);
    fileList[fileList.length-1] = fileVersion;
}       
//prints all the version-related files
for (File f : fileList) {
    try {
        BufferedReader myReader = new BufferedReader(new FileReader(f));
        String strLine = null;
        while ((strLine = myReader.readLine()) != null) {
            System.out.println(strLine);
        }
        myReader.close();
    } catch (Exception e) {
        System.err.println("Error: " + e.getMessage());
    }
}

How to check java version at linux (RedHat6)

To answer your question directly, you can use

rpm -qi java

OR

yum info "java"

For future Referenecs . You can try any of these commands.

rpm -qi "package_name_without_quotes"

It gives information of installed package. To display information about one or more packages (glob expressions are valid here as well), use the following command :

yum info "package_name_without quotes"

OR

yum list "package_name_without_quotes"

OR

yum --showduplicates list "package_name_without_quotes"

The yum info package_name command is similar to the rpm -q --info package_name command, but provides as additional information the ID of the Yum repository the RPM package is found in.

You can also query the Yum database for alternative and useful information about a package by using the following command :

yumdb info "package_name_without_quotes"

This command provides additional information about a package, including the check sum of the package (and algorithm used to produce it, such as SHA-256), the command given on the command line that was invoked to install the package (if any), and the reason that the package is installed on the system.

Determine linux version from java

You can also have a look at lsb_release

lsb_release -a

would give you something like:

cyril@merlin:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 8.10
Release:    8.10
Codename:   intrepid

How can I get Ubuntu version using Java?

You can run any terminal command (like lsb_release -a) inside a Java class with

Runtime.getRuntime().exec("lsb_release -a");

And parse the output

EDIT: Clear solution

String[] args = new String[] {"/bin/bash", "-c", "lsb_release -r", "with", "args"};
Process proc = new ProcessBuilder(args).start();

Note: You need to use lsb_release -r to get only the version.

Where can i find which version of java my pc uses

None of the versions you've listed are Java 8 for linux. The closest is openjdk-7-jre-headless, but that's Java 7. The gcj is part of gcc. To determine the version in Windows you can run,

java -version

or

java -fullversion

Linux version check Linux command or a Java code

Have you tried with?

cat /etc/*-release
cat /etc/redhat-release

or

cat /etc/issue

or

cat /proc/version

or even with

uname -a

Looking at Java documentation I see you can get few basic information about the operating system via System.getProperty(), I suppose you use Java Standard Edition 6.0. But very likely also other versions should return same infos.

• os.name Operating system name
• os.arch Operating system architecture
• os.version Operating system version

How to check java bit version on Linux?

Run java with -d64 or -d32 specified, it will give you an error message if it doesn't support 64-bit or 32-bit respectively. Your JVM may support both.

Java version issue in linux server

(1)Use following command to detect installed java version

sudo update-alternatives --config java

(2)Select selection number & Enter

(3)Re-Check java version with

java -version

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