CentOS 7
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Install Ruby 2.62020/01/30

The version of Ruby in CentOS 7 repository is 2.0 but Install 2.6 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 2.6 is located on another PATH.
# install from SCLo

[root@dlp ~]#
yum --enablerepo=centos-sclo-rh -y install rh-ruby26
[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-ruby26 bash
[root@dlp ~]#
ruby -v

ruby 2.6.2p47 (2019-03-13 revision 67232) [x86_64-linux]
[root@dlp ~]#
which ruby

[3] If you'd like to enable Ruby 2.6 automatically at login time, configure like follows.
[root@dlp ~]#
vi /etc/profile.d/rh-ruby26.sh
# create new

source /opt/rh/rh-ruby26/enable
export X_SCLS="`scl enable rh-ruby26 'echo $X_SCLS'`"
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