/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.command.system;
import gnu.java.security.action.GetEnvAction;
import java.io.PrintWriter;
import java.security.AccessController;
import java.util.Map;
import java.util.TreeMap;
import org.jnode.shell.AbstractCommand;
/**
* This command prints the current environment variables. A regular JNode command
* cannot set environment variables because the Java APIs do not allow this. Environment
* variable setting is accomplished by the shell / interpreter and builtin commands, it at all.
*
* @author crawley@jnode.org
*/
public class PrintEnvCommand extends AbstractCommand {
private static final String help_super = "Print the current environment variables";
public PrintEnvCommand() {
super(help_super);
}
public static void main(String[] args) throws Exception {
new PrintEnvCommand().execute(args);
}
/**
* Execute this command
*/
public void execute() throws Exception {
final Map<String, String> env =
(Map<String, String>) AccessController.doPrivileged(new GetEnvAction());
final TreeMap<String, String> sortedEnv = new TreeMap<String, String>(env);
final PrintWriter out = getOutput().getPrintWriter();
for (Map.Entry<String, String> entry : sortedEnv.entrySet()) {
out.println(entry.getKey() + '=' + entry.getValue());
}
}
}