List of running programs in Linux using java

Question

I'm trying to code a task manager for Linux using Java.

I need to get a list of running programs. And other info like: memory usage, cpu usage ...

Is this possible from Java?

Thanks.

das_weezul · Accepted Answer · 2011-07-12 14:31:08Z

6

try {
    // Execute command
    String command = "ps aux";
    Process child = Runtime.getRuntime().exec(command);

    // Get the input stream and read from it
    InputStream in = child.getInputStream();
    int c;
    while ((c = in.read()) != -1) {
        process((char)c);
    }
    in.close();
} catch (IOException e) {
}

Source (modified): http://www.exampledepot.com/egs/java.lang/ReadFromCommand.html

answered Jul 12, 2011 at 14:31

das_weezul

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2 Comments

David Weiser Over a year ago

Nice! Much more descriptive than my answer!

das_weezul Over a year ago

Thanks, but I more or less copypasted the example from the page mentioned ;)

Edwin Buck · Accepted Answer · 2011-07-12 14:29:46Z

1

It is possible, in systems that use the /proc virtual filesystem, you can just transverse the directories and cat out the information under /proc.

The numbered directories in /proc are the process ids of running processes, and the items within those directories help describe the process.

For memory usage and cpu information, there are /proc/meminfo and /proc/cpuinfo (and a lot more). Hopefully that will get you started.

For systems that lack the /proc virtual filesystem, you need to use JNI to bind to C code which will do kernel API calls, or attempt to run local command line programs thorough an exec while piping and parsing the output back into the Java program.

answered Jul 12, 2011 at 14:29

Edwin Buck

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Comments

David Weiser · Accepted Answer · 2011-07-12 14:31:21Z

0

Try using the exec(String command). You can then get the input stream from the resulting Process.

answered Jul 12, 2011 at 14:31

David Weiser

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