Executing Windows and Linux commands in Java

Below example illustrates how to execute the Windows and Linux commands in Java.Note that we are using org.apache.commons.lang.SystemUtils class to determine OS type.

if(SystemUtils.IS_OS_LINUX) {
            cmd= [ "/bin/bash", "-c", " ps -fu`whoami`|grep p1|grep -v grep" ]
        } else if (SystemUtils.IS_OS_WINDOWS) {
            cmd= ["bash", "-c", "tasklist | grep p1"]
        }

 StringBuffer output = new StringBuffer();
        try {
            Process p = Runtime.getRuntime().exec(cmd);
            List<String> result = IOUtils.readLines(p.getInputStream());
            for (String line : result) {
                System.out.println(line);
                output.append(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return output.toString();

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