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Describe when someone would need this information. For example "when connecting to wi-fi for the first time".

Step-by-step guide

Add the steps involved:

Download tomcat from http://tomcat.apache.org/download-70.cgi - if you do this from a browser, the download location will be <userHome>/Downloads
Extract the tar.gz using tar - if you are in your <userHome>/Downloads, tar will extract to <userHome>/Downloads
Move the extracted folder into a sub-folder of your home folder - so if you extracted it to the <userHome>Downloads/tomcat, you will move it to <userHome>/tomcat
cd to tomcat/bin, ls the contents, there are two files for starting and stopping tomcat: startup.sh and shutdown.sh. You can either change the permissions of these files so that you can execute them as super user/root
To make life easier for yourself, add <userHome/tomcat/bin to your PATH so that you can execute the tomcat commands from anywhere on the machine

Alternatively using wget

Installing java

check if you java installed
1. java -version

if it's not installed run the commands below, otherwise go to installing tomcat

install jdk (must be jdk) using alternatives (this application ensures that you can install several versions of the jdk on your machine)

cd /opt/
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u91-b14/jdk-8u91-linux-x64.tar.gz"

tar xzf jdk-8u91-linux-x64.tar.gz
 
cd /opt/jdk1.8.0_91/
alternatives --install /usr/bin/java java /opt/jdk1.8.0_91/bin/java 2
alternatives --config java


There are 3 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*  1           /opt/jdk1.7.0_71/bin/java
 + 2           /opt/jdk1.8.0_45/bin/java
   3           /opt/jdk1.8.0_77/bin/java
   4           /opt/jdk1.8.0_91/bin/java

Enter to keep the current selection[+], or type selection number: 4

At this point the JDK should be installed, I now recommend you ensure that javac is available

alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_91/bin/jar 2
alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_91/bin/javac 2
alternatives --set jar /opt/jdk1.8.0_91/bin/jar
alternatives --set javac /opt/jdk1.8.0_91/bin/javac

Check your java version with
1. java -version
Setup three very important variables
JAVA_HOME
1. ```
export JAVA_HOME=/opt/jdk1.8.0_91
```

JRE_HOME

export JRE_HOME=/opt/jdk1.8.0_91/jre

PATH

export PATH=$PATH:/opt/jdk1.8.0_91/bin:/opt/jdk1.8.0_91/jre/bin

We are now ready to install tomcat

Fetch the version of tomcat you want from apache.org

cd /opt
wget http://www.us.apache.org/dist/tomcat/tomcat-8/v8.0.27/bin/apache-tomcat-8.0.27.tar.gz
tar xzf apache-tomcat-8.0.27.tar.gz

Configuring Environment variables

echo "export CATALINA_HOME="/opt/apache-tomcat-8.0.27"" >> ~/.bashrc
source ~/.bashrc

Starting tomcat

cd /opt/apache-tomcat-8.0.27
./bin/startup.sh

<userHome> == ~/

Use the following command to extract from a tar.gz file: tar -xzf <tar.gz file>

Remember some commands can only issued as root, if you log in as root and execute the commands, remember to exit from root and test that what you wanted to happen works as s none root user

Step-by-step guide

Alternatively using wget

Installing java

We are now ready to install tomcat

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