Install git, nginx, mysql, mongodb, redis, node.js(+nvm), and mono on Ubuntu

#!/bin/bash

###################################
# Usage: sudo ./installer.sh [os] #
###################################

OS=$1;
UBUNTU="ubuntu";

#############
# Functions #
#############

check_os() {
        if [ "$OS" = "$UBUNTU" ]; then
                echo "Target OS is $OS";
        else
                echo "$OS is not supported";
                exit 1;
        fi
}

update() {
        echo "Updating";

        if [ "$OS" = "$UBUNTU" ]; then
                `echo apt-get update`;
        fi
}

install_git() {
        echo "Installing git";

        if [ "$OS" = "$UBUNTU" ]; then
                `echo apt-get install git-all`;
        fi
}

install_nginx() {
        echo "Installing nginx";

        if [ "$OS" = "$UBUNTU" ]; then
                `echo apt-get install nginx`;
        fi

}

install_mysql() {
        echo "Installing mysql";

        if [ "$OS" = "$UBUNTU" ]; then
                `echo apt-get install mysql-server`;
                `echo mysql_secure_installation`;
                `echo mysql_install_db`;
        fi
}

install_mongodb() {
        echo "Installing mongodb";

        if [ "$OS" = "$UBUNTU" ]; then
                `echo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927`;
                `echo "deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list`;
                update;
                `echo apt-get install -y mongodb-org`;
        fi
}

install_redis() {
        echo "Installing redis";

        if [ "$OS" == "$UBUNTU" ]; then
                `echo apt-get install build-essential`;
                `echo apt-get install tcl8.5`;
                `echo wget http://download.redis.io/releases/redis-stable.tar.gz && tar xzf redis-stable.tar.gz`;
                `echo cd redis-stable`;
                `echo make`;
                `echo make test`;
                `echo make install`;
                `echo cd utils`;
                `echo ./install_server.sh`;
        fi
}

install_nodejs() {
        echo "Installing node.js";

        if [ "$OS" = "$UBUNTU" ]; then
                # install node.js
                `echo apt-get install nodejs`;
                # install nvm
                `echo curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.31.0/install.sh | bash`;
        fi
}

install_mono() {
        echo "Installing mono";

        if [ "$OS" = "$UBUNTU" ]; then
                `echo sudo apt-get install mono-complete`;
        fi
}

##############
# Operations #
##############

check_os;

install_git;

install_nginx;

install_mysql;

install_mongodb;

install_redis;

install_nodejs;

install_mono;

echo "All done";

exit 0;