Java program to run SSH commands

Hi,

Recently I was searching about how to be able to execute linux commands from java connecting to remote servers using SSH.

My first approach was trying to wrap a shell script allowing me to skip the password prompt passing it as a parameter to the ssh call… It was not easy to find how to do it. At the end it seems that it is possible using Expect scripts ( http://en.wikipedia.org/wiki/Expect )

But then I found JSch: A java lib which is a pure Java implementation of SSH2. Which is what I was looking for. You can donwload it from http://www.jcraft.com/jsch/

Below you can find my sample piece of code which is mostly copied from: http://www.journaldev.com/246/java-program-to-run-shell-commands-on-ssh-enabled-system

 

public static String cmdExecSSH(String host, String user, String password, String cmd ){

String s = null;

try{

 

java.util.Properties config = new java.util.Properties();

config.put(“StrictHostKeyChecking”, “no”);

JSch jsch = new JSch();

Session session=jsch.getSession(user, host, 22);

session.setPassword(password);

session.setConfig(config);

session.connect();

System.out.println(“Connected “+user+”@”+host);

 

Channel channel=session.openChannel(“exec”);

((ChannelExec)channel).setCommand(cmd);

channel.setInputStream(null);

((ChannelExec)channel).setErrStream(System.err);

 

InputStream in=channel.getInputStream();

channel.connect();

byte[] tmp=new byte[1024];

while(true){

while(in.available()>0){

int i=in.read(tmp, 0, 1024);

if(i<0)break;

String line = new String(tmp, 0, i);

s = (s == null)?line:(s+”\n”+line);

}

if(channel.isClosed())

break;

try{Thread.sleep(1000);}catch(Exception ee){}

}

channel.disconnect();

session.disconnect();

System.out.println(“DONE”);

}catch(Exception e){

e.printStackTrace();

}

return (s != null)?s:”no matches found”;

}

How to install Tomcat in Mac OS

How to install Tomcat in Mac OS

 1. Check that java is installed in your computer

By default MAC comes with java installed, you do not have to do anything special expect that you want an specific java version running.

Open a Terminal and do the check:

$ java -version

java version “1.6.0_51”

Java(TM) SE Runtime Environment (build 1.6.0_51-b11-457-11M4509)

Java HotSpot(TM) 64-Bit Server VM (build 20.51-b01-457, mixed mode)

2. Download the apache tomcat

Tomcat is software that permits a web request to be directed to a piece of Java code (servlet) with some associated infrastruture to handle cookies and request/reply coordination. These functions are collectively referred to as a “web container”.   Tomcat used to also be referred to as Catalina. The Catalina name is still used in some of the config setup below

 Download Tomcat 7 Binary Distribution Core (tar.gz) from the Apache Tomcat 7 Downloads Page and uncompress it into a directory of your choice.

Copy the files to your /usr/local folder:

$ sudo mv /Users/<your_user>/Downloads/apache-tomcat-7.0.53.tar.gz /usr/local

Uncompress the downloaded file:

$ sudo gnutar -xzvf apache-tomcat-7.0.53.tar.gz

Now you are ready to startup, use and shutdown yout Toncat server:

$ cd apache-tomcat-7.0.53/bin/

$ ./startup.sh

At this point you can test that your sever is up and running from a navigator with http://localhost:8080/

You can shutdown the server just typing:

$ ./shutdown.sh

3. Set the environment variables

Edit the bash profile with an editor like vi and add the following lines:

$ sudo vi ~/.bash_profile

# Tomcat entries

export CATALINA_BASE=”/usr/local/apache-tomcat-7.0.53″

export CATALINA_HOME=”/usr/local/apache-tomcat-7.0.53″

export CATALINA_TMPDIR=”/usr/local/apache-tomcat-7.0.53/temp”

Save it and reload the bash profile:

$ . ~/.bash_profile

4. Deploy and test an application

copy or deploy your test application with its own folder in /usr/local/apache-tomcat-7.0.53/webapps/myTestApp

Open a navigator and type test your URL: http://localhost/myTestApp/myIndex.jsp

How to check the Oracle Mobile repository consistency

Oracle Reference

New Diagnostic Tool For the Oracle Lite Repository: MSRDT [ID 458350.1]
Modified 17-MAY-2010     Type ANNOUNCEMENT     Status PUBLISHED

Applies to:

Oracle Lite – Version: 10.3.0.1.0 to 10.3.0.1.0 – Release: 10.3 to 10.3Information in this document applies to any platform.

What do you need to do?

To use Mobile Server Repository Diagnostic Tool (MSRDT), you need to go into this directory:

$ORACLE_HOME/mobile/server/admin

Usage: msrdt -v username/password@jdbc:oracle:thin:@hostname:portNo:SID

For example:

msrdt.sh -v mobileadmin/manager@jdbc:oracle:thin:@mcharpen-fr.fr.oracle.com:1521:orcl2

If you need to send the Report to the Oracle Support, please this command:

msrdt.sh -v mobileadmin/manager@jdbc:oracle:thin:@mcharpen-fr.fr.oracle.com:1521:orcl2 >>Report4Marc.txt

How to install Oracle SQLPlus and Oracle Client in MAC OS

Hi,

The How To has been extracted from the following link: http://www.joelennon.ie/2014/02/06/installing-oracle-instant-client-mac-os-x/

I just skipped some text and modified some paths to adapt it to oracle client 11.2.0.4 release.

=====================================

1. Download the files from the Oracle Site

http://www.oracle.com/technetwork/topics/intel-macsoft-096467.html

Be sure to grab the following two files:

  • Instant Client Package – Basic
  • Instant Client Package – SQL*Plus

2. Extract the files and create the proper folder structure.

Open a Terminal window and unzip the downloaded files.

$ unzip -qq instantclient-basic-macos.x64-11.2.0.4.0.zip

$ unzip -qq instantclient-sqlplus-macos.x64-11.2.0.4.0.zip

Note: The -qq flag will tell the unzip utility to run in quieter mode, preventing any output from being displayed on the screen.

By default, the archive will extract all these files to a single directory. Instead, we’ll create a nicely structured directory to keep these files in your user Applications folder.

$ mkdir -p /Applications/oracle/product/instantclient_64/11.2.0.4.0/bin

$ mkdir -p /Applications/oracle/product/instantclient_64/11.2.0.4.0/lib

$ mkdir -p /Applications/oracle/product/instantclient_64/11.2.0.4.0/jdbc/lib

$ mkdir -p /Applications/oracle/product/instantclient_64/11.2.0.4.0/rdbms/jlib

$ mkdir -p /Applications/oracle/product/instantclient_64/11.2.0.4.0/sqlplus/admin

$ mkdir -p /Applications/oracle/product/instantclient_64/11.2.0.4.0/network/admin

Next, move the files over to these directories as follows:

$ cd instantclient_11_2

$ mv ojdbc* /Applications/oracle/product/instantclient_64/11.2.0.4.0/jdbc/lib/

$ mv x*.jar /Applications/oracle/product/instantclient_64/11.2.0.4.0/rdbms/jlib/

$ mv glogin.sql /Applications/oracle/product/instantclient_64/11.2.0.4.0/sqlplus/admin/

$ mv *dylib* /Applications/oracle/product/instantclient_64/11.2.0.4.0/lib/

$ mv *README /Applications/oracle/product/instantclient_64/11.2.0.4.0/

$ mv * /Applications/oracle/product/instantclient_64/11.2.0.4.0/bin/

3. Create a proper tnsnames.ora file to define proper connection strings

Copy or create a tnsnames.ora file to /Applications/oracle/product/instantclient_64/11.2.0.4.0/network/admin/

Example:

Create the tnsnames.ora file with the vi editor, paste the following lines and save it.

MYDB=

  (DESCRIPTION=

    (ADDRESS=

      (PROTOCOL=TCP)

      (HOST=*********)

      (PORT=1521)

    )

    (CONNECT_DATA=

      (SERVER=dedicated)

      (SID=MYDB-SID)

    )  )

(You can better ask to a DBA to review the content of this file and ask her to provide you with a proper test connection)

4. Set up environment variables

Edit or create a file .bash_profile

$ cd /Users/UserName

$ vi ~/.bash_profile

if you haven’t created a .bash_profile before the file will be empty, otherwise just add the following lines to the end of the existing file.

export ORACLE_HOME=/Applications/oracle/product/instantclient_64/11.2.0.4.0

export PATH=$ORACLE_HOME/bin:$PATH

export DYLD_LIBRARY_PATH=$ORACLE_HOME/lib

To load this profile, run the following command:

$ source ~/.bash_profile

Assuming you have set up your tnsnames.ora file correctly, you should now be able to connect one of the databases as follows:

5. Start using SQLPlus

$ sqlplus username/password@database

6. Did you enjoy? That’s all folks.

🙂

**********************************

Fixing command history for using SQLPlus line edition with arrow keys

If you have used the command-line SQLPlus in a Windows environment, you will probably be used to using the command history to execute previous SQL statements using the arrow keys. One thing you’ll notice in SQLPlus for the Mac is that this doesn’t work by default, if you hit the up key you’ll see a strange character sequence ^[[A rather than the previous command. Let’s go ahead and fix this now.

To do this, you’ll need to use rlwrap. You could download this from source and build it yourself, but I find it much easier to use the fantastic brew package manager for Mac OS X. Head over to http://brew.sh/ and follow the instructions to install and set up Homebrew (it’s very easy). With Homebrew installed, you can now easily install rlwrap on your system with one command:

$ ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)”

$ brew install rlwrap

The final thing you need to do is tell your system to use rlwrap whenever you use SQL*Plus. To do that, you’ll need to edit your .bash_profile file again.

$ vi ~/.bash_profile

Add the following line to the end of the file.

alias sqlplus=’rlwrap sqlplus’

Now reload the .bash_profile:

$ source ~/.bash_profile

Now, when you launch SQL*Plus and try to use the arrow keys to access previous commands, it will work.

Apache server on Mac OS

Manage the Apache server

Terminal Commands

  • Starting:  $sudo apachectl start
  • Stopping: $sudo apachectl stop
  • Restarting: $sudo apachectl restart

Adding the Web Sharing option in Systems Preferences:
http://clickontyler.com/blog/2012/02/web-sharing-mountain-lion/

Configuring Sites folder

http://www.maketecheasier.com/setup-web-server-in-mountain-lion/

By default, Apache serves files that are in the folder location “/Library/WebServer/Documents”.
On a multiple users system, you can setup the web server to serve files for different users
using the URL “http://localhost/~tomeu.mir“.

1. create a folder Sites in /Users/tomeu.mir
$mkdir /Users/tomeu.mir/Sites

2. create a tomeu.mir.conf file in the apache server users folder:
$sudo vi /etc/apache2/users/tomeu.mir.conf

and copy and paste the following code to the conf file.

<Directory “/Users/tomeu.mir/Sites/”>
Options Indexes MultiViews
AllowOverride All
Order allow,deny
Allow from all
</Directory>

3. test it

create a test html file and place it in /Users/tomeu.mir/Sites/

$cd /Users/tomeu.mir/Sites/
$vi myTest.html

insert your html test code and save it.

<html><body><h1>My site works cojones</h1></body></html>

Go to your browser and type: http://localhost/~tomeu.mir/myTest.html