Install Ruby 2.22015/04/06

	The version of Ruby in CentOS 6 repository is 1.8 but Install 2.2 with RPM package if you need.
[1]	It's possible to install from CentOS SCLo Software Collections. It's OK to install it even if 1.8 is already installed because 2.2 is located on another PATH.

# install from SCLo

[root@dlp ~]#

yum --enablerepo=centos-sclo-rh -y install rh-ruby22

[2]	Packages from Software Collections are installed uder the /opt directory. To use it, Load environment variables like follows.

# load environment variables

[root@dlp ~]#

scl enable rh-ruby22 bash

[root@dlp ~]#

ruby -v

ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux-gnu]

[root@dlp ~]#

which ruby

/opt/rh/rh-ruby22/root/usr/bin/ruby

[3]	If you'd like to enable Ruby 2.2 automatically at login time, configure like follows.

[root@dlp ~]#

vi /etc/profile.d/rh-ruby22.sh

# create new

#!/bin/bash

source /opt/rh/rh-ruby22/enable
export X_SCLS="`scl enable rh-ruby22 'echo $X_SCLS'`"
export PATH=$PATH:/opt/rh/rh-ruby22/root/usr/local/bin

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