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There is a newer version: 5.17.0
package org.codehaus.plexus.interpolation.os;

/*
 * The MIT License
 *
 * Copyright (c) 2004, The Codehaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Properties;

/**
 * NOTE: This class was copied from plexus-utils, to allow this library
 * to stand completely self-contained.
 * 

 * @author Trygve Laugstøl 
 * @version $Id: OperatingSystemUtils.java 8252 2009-06-05 00:13:00Z igorife $
 */
public final class OperatingSystemUtils
{

    private OperatingSystemUtils()
    {
    }

    public static Properties getSystemEnvVars()
        throws IOException
    {
        return getSystemEnvVars( true );
    }

    /**
     * Return the shell environment variables. If caseSensitive == true, then envar
     * keys will all be upper-case.
     *
     * @param caseSensitive Whether environment variable keys should be treated case-sensitively.
     * @return Properties object of (possibly modified) envar keys mapped to their values.
     * @throws IOException
     */
    public static Properties getSystemEnvVars( boolean caseSensitive )
        throws IOException
    {
        Process p = null;

        try
        {
            Properties envVars = new Properties();
    
            Runtime r = Runtime.getRuntime();
    
            //If this is windows set the shell to command.com or cmd.exe with correct arguments.
            if ( Os.isFamily( Os.FAMILY_WINDOWS ) )
            {
                if ( Os.isFamily( Os.FAMILY_WIN9X ) )
                {
                    p = r.exec( "command.com /c set" );
                }
                else
                {
                    p = r.exec( "cmd.exe /c set" );
                }
            }
            else
            {
                p = r.exec( "env" );
            }
    
            BufferedReader br = new BufferedReader( new InputStreamReader( p.getInputStream() ) );
    
            String line;
    
            String lastKey = null;
            String lastVal = null;
    
            while ( ( line = br.readLine() ) != null )
            {
                int idx = line.indexOf( '=' );
    
                if ( idx > 0 )
                {
                    lastKey = line.substring( 0, idx );
    
                    if ( !caseSensitive )
                    {
                        lastKey = lastKey.toUpperCase();
                    }
    
                    lastVal = line.substring( idx + 1 );
    
                    envVars.setProperty( lastKey, lastVal );
                }
                else if ( lastKey != null )
                {
                    lastVal += "\n" + line;
    
                    envVars.setProperty( lastKey, lastVal );
                }
            }

            return envVars;
        }
        finally
        {
            if ( p != null )
            {
                p.destroy();
            }
        }
    }

}