Cocoapods: pod CLI not working anymore after HighSierra upgrade and cocoapods reinstall

[vitobellini]

Report

What did you do?

ℹ pod

What did you expect to happen?

ℹ pod should works

What happened instead?

ℹ Throws exception, gem not found
/Library/Ruby/Site/2.3.0/rubygems.rb:271:infind_spec_for_exe': can't find gem cocoapods (>= 0.a) (Gem::GemNotFoundException)
from /Library/Ruby/Site/2.3.0/rubygems.rb:299:in activate_bin_path' from /usr/local/bin/pod:23:in

'`

CocoaPods Environment

ℹ Unable to run pod env, same error of above

I'm using HighSierra, I have updated cocoa pods after OS upgrade by the following way:
sudo gem update --system sudo gem install -n /usr/local/bin cocoapods

I also have updated gems:
gem update --system

[consbulaquena]

I've also recently updated to HighSierra.
In Terminal:
1: sudo gem uninstall cocoapods

2: sudo gem install -n /usr/local/bin cocoapods