Installation of R studio and Tomcat in Ubuntu

How to install R Studio in Ubuntu. Intsalling R Studio in Ubuntu we have to  follow the 3 steps for installation those are listed. Laks Tutorial follow the simple and basic steps for installation
Step1:Goto terminal in ubuntu type sudo apt-getupdate press enter
Step 2: sudo apt-getinstall r-base press enter
Step 3:  Now download the  software R-Studio (32-bit) here or 64-bit
sudo dpkg -i <package name>   OR Install this software through Ubuntu Software Center.
Now you have successfully installed

Installation of Tomcat in Ubuntu
Before Tomcat installation in ubuntu first you need to install java
Step 1:
sudo apt-get update
sudo apt-get install openjdk-7-jdk
Download Tomcat package from apache site: 
After downloading, extract the file and copy the folder to 'web' folder in 'home' folder (create 'web' folder in 'home' folder).
Step 2:  Now path setup in .bashrc file
$ gedit .bashrc
go to end of the file and type
export CATALINA_HOME=/home/user/web/apache-tomcat-8.0.29
export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386
save and exit

Step 3:
Once the path setup complete, now run [start] tomcat service.
Go to the 'bin' folder of the tomcat
(ex.: /home/user/web/apache-tomcat-8.0.29/bin)
bin$ sh
To check open browser and open localhost:8080, click on 'Manager App' button.
user error

Step 4:
Setting up user for accessing App
Now open 'tomcat-users.xml' file in 'conf' folder of tomcat folder.
copy below text at <tomcat-users> field.
<role rolename="manager-gui"/>
<user username="admin" password="admin" roles="manager-gui"/>
save and exit

Now restart tomcat service

bin$ sh
bin$ sh

To check open browser and open localhost:8080, click on 'Manager App'
button then type "admin" in User Name and Password fields.

Now you have successfully install and configuring the tomcat in Ubuntu.

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