Specific version of MySQL 5.6 install on Ubuntu 14.04

MySQL_5.6_install_Ubuntu14.04.sh

#!/bin/bash

#
# This script is not fully tested against data safety. Backup data and use at your own risk.
# To get available MySQL 5.6 versions, refer to https://dev.mysql.com/doc/relnotes/mysql/5.6/en/
#

version=$(cat /etc/*release | grep -Po '(?<=^VERSION_ID=")[0-9.]+')
sys_name=$(cat /etc/*release | grep -Po '(?<=^NAME=").*(?=")')

if [ "$sys_name" == 'Ubuntu' ] && [ "$version" == '14.04' ]; then
    echo "This script only installs a specific minor version of MySQL 5.6."

   
else
    echo "This script only runs on Ubuntu 14.04 system. Abort."
    exit 1
fi

echo "Please note that this script only runs with root privilege."
echo "If you are running with a user that needs password with sudo, you will need to enter your password now and probably later again."

if sudo echo -n ""
then
    echo "Root privilege check PASS."
else
    echo "Root privilege check FAIL. Abort."
    exit 1
fi

echo -n "Enter the minor version you want, e.g. for 5.6.33 in just type 33 and press [ENTER]: "
read -r version

if [[ ! $version =~ ^[0-9]+$ ]];then
    echo "'${version}' isn't a valid number. Abort."
    exit 1
fi

full_version="5.6.$version"

# version_match(package_name)
#
# Returns 0 if the specified version of package is installed,
# otherwise returns 1.
version_match() {
    test $(sudo dpkg -s "$1" | grep -Po '(?<=^Version:\s)[0-9.]+') == "$full_version"
    return $?
}

# check for installed version
if version_match "mysql-server" && \
    version_match "mysql-community-server" && \
    version_match "mysql-client" && \
    version_match "mysql-community-client" && \
    version_match "mysql-common"; then

    printf "\\nMySQL %s already installed. Abort.\\n\\n" "$full_version"
    exit 0
fi

exit 0

tmp_dir=$(mktemp -d)
download_dir="$tmp_dir/mysql-server_$full_version"
mkdir "$download_dir"

printf "Downloading install package for MySQL %s to $download_dir.\\n\\n" "$full_version"

if ! wget -q "https://dev.mysql.com/get/Downloads/MySQL-5.6/mysql-server_$full_version-1ubuntu14.04_amd64.deb-bundle.tar" -O "$download_dir/bundle.tar"
then
    echo "Error downloading. Exit."
    exit 1;
fi

echo "Removing old packages..."
sudo dpkg -r "mysql-server" && \
sudo dpkg -r "mysql-community-server" && \
sudo dpkg -r "mysql-client" && \
sudo dpkg -r "mysql-community-client" && \
sudo dpkg -r "mysql-common"

if [ $? != 0 ]; then
    printf "\\nError removing old packages. Abort for safe.\\n"
    exit 1
fi

echo "Installing new packages..."
cd "$download_dir" && tar xf bundle.tar
sudo dpkg -i "mysql-common_$full_version-1ubuntu14.04_amd64.deb" && \
sudo dpkg -i "mysql-community-client_$full_version-1ubuntu14.04_amd64.deb" && \
sudo dpkg -i "mysql-client_$full_version-1ubuntu14.04_amd64.deb" && \
sudo dpkg -i "mysql-community-server_$full_version-1ubuntu14.04_amd64.deb" && \
sudo dpkg -i "mysql-server_$full_version-1ubuntu14.04_amd64.deb"

if [ $? != 0 ]; then
    printf "\\nError installing. Sorry but you have to fix manually.\\n"
    exit 1
fi

printf "\\nMySQL %s installed successfully.\\n" "$full_version"