Install Ruby 2.52018/08/10

	The version of Ruby in CentOS 7 repository is 2.0 but Install 2.5 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 2.0 is already installed because 2.5 is located on another PATH.

# install from SCLo

[root@dlp ~]#

yum --enablerepo=centos-sclo-rh -y install rh-ruby25

[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-ruby25 bash

[root@dlp ~]#

ruby -v

ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-linux]

[root@dlp ~]#

which ruby

/opt/rh/rh-ruby25/root/usr/bin/ruby

[3]	If you'd like to enable Ruby 2.5 automatically at login time, configure like follows.

[root@dlp ~]#

vi /etc/profile.d/rh-ruby25.sh

# create new

#!/bin/bash

source /opt/rh/rh-ruby25/enable
export X_SCLS="`scl enable rh-ruby25 'echo $X_SCLS'`"

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