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Java > Open Source Codes > examples > rexec


1 /*
2  * Copyright 2001-2005 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package examples;
17
18 import java.io.IOException JavaDoc;
19 import org.apache.commons.net.bsd.RExecClient;
20
21 /***
22  * This is an example program demonstrating how to use the RExecClient class.
23  * This program connects to an rexec server and requests that the
24  * given command be executed on the server. It then reads input from stdin
25  * (this will be line buffered on most systems, so don't expect character
26  * at a time interactivity), passing it to the remote process and writes
27  * the process stdout and stderr to local stdout.
28  * <p>
29  * Example: java rexec myhost myusername mypassword "ps -aux"
30  * <p>
31  * Usage: rexec <hostname> <username> <password> <command>
32  * <p>
33  ***/
34
35 // This class requires the IOUtil support class!
36 public final class rexec
37 {
38
39     public static final void main(String JavaDoc[] args)
40     {
41         String JavaDoc server, username, password, command;
42         RExecClient client;
43
44         if (args.length != 4)
45         {
46             System.err.println(
47                 "Usage: rexec <hostname> <username> <password> <command>");
48             System.exit(1);
49             return ; // so compiler can do proper flow control analysis
50 }
51
52         client = new RExecClient();
53
54         server = args[0];
55         username = args[1];
56         password = args[2];
57         command = args[3];
58
59         try
60         {
61             client.connect(server);
62         }
63         catch (IOException JavaDoc e)
64         {
65             System.err.println("Could not connect to server.");
66             e.printStackTrace();
67             System.exit(1);
68         }
69
70         try
71         {
72             client.rexec(username, password, command);
73         }
74         catch (IOException JavaDoc e)
75         {
76             try
77             {
78                 client.disconnect();
79             }
80             catch (IOException JavaDoc f)
81             {}
82             e.printStackTrace();
83             System.err.println("Could not execute command.");
84             System.exit(1);
85         }
86
87
88         IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
89                          System.in, System.out);
90
91         try
92         {
93             client.disconnect();
94         }
95         catch (IOException JavaDoc e)
96         {
97             e.printStackTrace();
98             System.exit(1);
99         }
100
101         System.exit(0);
102     }
103
104 }
105
106
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