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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.mvel2.sh.command.basic;

import org.mvel2.sh.Command;
import org.mvel2.sh.CommandException;
import org.mvel2.sh.ShellSession;

import java.util.Map;

public class ShowVars implements Command {


  public Object execute(ShellSession session, String[] args) {
    boolean values = false;

    Map vars = session.getVariables();

    for (int i = 0; i < args.length; i++) {
      if ("-values".equals(args[i])) values = true;
      else throw new CommandException("unknown argument: " + args[i]);
    }

    System.out.println("Printing Variables ...");
    if (values) {
      for (String key : vars.keySet()) {
        System.out.println(key + " => " + String.valueOf(vars.get(key)));
      }
    }
    else {
      for (String key : vars.keySet()) {
        System.out.println(key);
      }
    }

    System.out.println(" ** " + vars.size() + " variables total.");

    return null;
  }


  public String getDescription() {
    return "shows current variables";
  }

  public String getHelp() {
    return "no help yet";
  }
}