I have two ruby installations on my ubuntu 14.04. like this
nifras@Nifras-pc:~$ ruby -v
ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]
nifras@Nifras-pc:~$ ruby2.3 -v
ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-linux-gnu]
How do I remove 2.4.0p0 and make ruby 2.3.3p222 as default one.