install_hadoop.sh

#!/bin/bash 

# Update system
sudo apt-get update && sudo apt-get dist-upgrade

# Install Java
sudo apt-get install default-jdk-headless  

# Download & Install Hadoop
wget http://apache.mirrors.tds.net/hadoop/common/hadoop-2.8.2/hadoop-2.8.2.tar.gz -P ~/Downloads
sudo tar zxvf ~/Downloads/hadoop-* -C /usr/local
sudo mv /usr/local/hadoop-* /usr/local/hadoop

# Configure environment (copy the whole block)
echo "
export JAVA_HOME=$(readlink -f $(which java))
export PATH=\$PATH:\$JAVA_HOME/bin
export HADOOP_HOME=/usr/local/hadoop
export PATH=\$PATH:\$HADOOP_HOME/bin
export HADOOP_CONF_DIR=/usr/local/hadoop/etc/hadoop
" >> ~/.bashrc

# Load configure
source ~/.bashrc