The Linux Juggernaut

How to set java path in Linux?

Ans : Check where java is installed by using below command

#update-alternatives --config java
This command will show installed java packages in your machine.

Example output :
# update-alternatives --config java

There are 2 programs which provide ‘java’.

Selection ———————————————–

1 /usr/lib/jvm/jre-1.4.2-gcj/bin/java *+

2
From above you can see java version and its location.

Setting java path(In Temporary way)

#JAVA_HOME=/usr/lib/jvm/jre-1.6.0-openjdk

#export $JAVA_HOME

Setting java path (In Permanent way)… Continue Reading

This is possible with renaming of the scripts located in running configuration(rc) folders such as /etc/rc1.d, /etc/rc2.d etc. Each of these folders are corresponding to the scripts that will start in that run-level respectively. For example if you want to start some script in runlevel 1, then they should be kept in /etc/rc1.d folder so that when Linux OS is booting up these scripts are executed.

So how can I set priority to my scripts/services?
 Just go in to … Continue Reading

This post is regarding how to change java version if multiple java versions are installed?

Check what are the java versions are installed on your system

#java -version

Example output

OpenJDK Runtime Environment (build 1.6.0-b09)

OpenJDK Client VM (build 1.6.0-b09, mixed mode)

So now I want to change the one version to another version.

If more than one java is installed. Execute below command to see how many java versions are installed? And what … Continue Reading

How we can login to remote server through ssh?

#ssh user@servername

or

#ssh -l user servername

or

#ssh ip-add

So when you will execute the above command you will get the password prompt. But if you want to see what will happen when you execute ssh command you have to enable verbose or debugging mode. To do this we have to apply -v option at the time of login as shown in below example.

#ssh … Continue Reading