[Bash] Instalador de Ruby (ultima version) en RHEL/CentOS

#!/bin/bash
#
##############################################################
#
# Author: B3N
# Name: ruby-installer
# Version: 1.0
# Description: Install the lastest version of Ruby using rbenv
# Licence: GPLv2
# Platform: RHEL/CentOS/Fedora
#
##############################################################


# Logo
echo
echo "============================================================"
echo "               Ruby Installer v1.0 - By B3N"
echo "============================================================"
echo
echo "[i] rbenv and ruby will be installed only for the user $USER"

# Dependencies
rpm -q openssl-devel readline-devel zlib-devel git > /dev/null
if [ $? -ne 0 ]; then
	if [ `id -u` == 0 ]; then
		echo "[+] Installing dependencies..."
		yum install -y openssl-devel readline-devel zlib-devel git
			if [ $? -ne 0 ]; then
				exit 1
			fi
	else
		echo "[+] Installing dependencies..."
		su -c 'yum install -y openssl-devel readline-devel zlib-devel git'
		if [ $? -ne 0 ]; then
			exit 1
		fi
	fi
fi

# Clone rbenv repo
if [ -d ~/.rbenv ]; then
	echo "[-] Directory ~/.rbenv exists."
else
	git clone https://github.com/sstephenson/rbenv.git ~/.rbenv
	if [ $? -eq 0 ]; then
		echo "[+] rbenv repo cloned to ~/.rbenv."
	fi
fi

# PATH
if [ -d ~/.rbenv/bin ]; then
	grep 'export PATH="$HOME/.rbenv/bin:$PATH"' ~/.bashrc > /dev/null
	if [ $? -ne 0 ]; then
		echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
		export PATH="$HOME/.rbenv/bin:$PATH"
		echo "[+] rbenv added to PATH"
	else
		echo "[-] rbenv is in the PATH."
	fi
else
	exit 1
fi

# Autocompletion
if [ -d ~/.rbenv/bin ]; then
	grep 'eval "$(rbenv init -)"' ~/.bashrc > /dev/null
	if [ $? -ne 0 ]; then
		echo 'eval "$(rbenv init -)"' >> ~/.bashrc
		eval "$(rbenv init -)"
		echo "[+] Autocompletion activated."
	else
		echo "[-] Autocompletion already activated."
	fi
else
	exit 1
fi

## Plugins:
# ruby-build
if [ -d ~/.rbenv/plugins/ruby-build ]; then
	echo "[-] Directory ~/.rbenv/plugins/ruby-build exists."
else
	git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
	if [ $? -eq 0 ]; then
		echo "[+] Plugin ruby-build installed."
	fi
fi
# rbenv-rehash
if [ -d ~/.rbenv/plugins/rbenv-gem-rehash ]; then
	echo "[-] Directory ~/.rbenv/plugins/rbenv-gem-rehash exists."
else
	git clone https://github.com/sstephenson/rbenv-gem-rehash.git ~/.rbenv/plugins/rbenv-gem-rehash
	if [ $? -eq 0 ]; then
		echo "[+] Plugin rbenv-rehash installed."
	fi
fi

# Install ruby
if [ -x ~/.rbenv/libexec/rbenv ]; then
	rbenv install -l
	read -p "Type version to install: " RV
	if [ `rbenv version|awk -F " " {'print $1'}` == $RV ]; then
		echo "[-] Ruby $RV already installed, nothing to do."
	else
		rbenv install -v -k $RV
		rbenv global $RV
		echo "[i] Restart your terminal to finish."
	fi
else
	echo "[-] rbenv is not installed."
fi