Can't create rails project - ruby-on-rails

Question

Can't create a rails project after installing rails.
Mac Mojave 10.14.6
$ ruby -v
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin18]
$ which ruby
/usr/local/opt/ruby/bin/ruby
$ gem -v
3.1.2
$ sudo gem install rails
Successfully installed rails-6.0.2.2
Parsing documentation for rails-6.0.2.2
Done installing documentation for rails after 0 seconds
1 gem installed
Then tried to create a rails project
$ rails new blah
Rails is not currently installed on this system. To get the latest version, simply type:
$ sudo gem install rails
You can then rerun your "rails" command.
$ which rails
/usr/bin/rails
Any ideas why I can't create a rails project as rails seems to be installed?
$ gem env
RubyGems Environment:
- RUBYGEMS VERSION: 3.1.2
- RUBY VERSION: 2.7.1 (2020-03-31 patchlevel 83) [x86_64-darwin18]
- INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/2.7.0
- USER INSTALLATION DIRECTORY: /Users/shanegibney/.gem/ruby/2.7.0
- RUBY EXECUTABLE: /usr/local/opt/ruby/bin/ruby
- GIT EXECUTABLE: /usr/local/bin/git
- EXECUTABLE DIRECTORY: /usr/local/lib/ruby/gems/2.7.0/bin
- SPEC CACHE DIRECTORY: /Users/shanegibney/.gem/specs
- SYSTEM CONFIGURATION DIRECTORY: /usr/local/Cellar/ruby/2.7.1/etc
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-darwin-18
- GEM PATHS:
- /usr/local/lib/ruby/gems/2.7.0
- /Users/shanegibney/.gem/ruby/2.7.0
- /usr/local/Cellar/ruby/2.7.1/lib/ruby/gems/2.7.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- https://rubygems.org/
- SHELL PATH:
- /usr/local/opt/ruby/bin
- /usr/local/opt/ruby/bin
- /usr/local/opt/ruby/bin
- /usr/local/opt/ruby/bin
- /opt/local/bin
- /opt/local/sbin
- /opt/local/bin
- /opt/local/sbin
- /usr/local/sbin
- /usr/local/mysql/bin
- /usr/local/bin
- /usr/bin
- /bin
- /usr/sbin
- /sbin
- /Library/TeX/texbin
- /opt/X11/bin
- /Library/Frameworks/Mono.framework/Versions/Current/Commands
- /opt/ImageMagick/bin
- /Applications/Wireshark.app/Contents/MacOS
Then,
$ /usr/bin/rails new blah
Rails is not currently installed on this system. To get the latest version, simply type:
$ sudo gem install rails
You can then rerun your "rails" command.
-bash: tail: command not found
-bash: sed: command not found
Also tried,
$ export PATH="/usr/bin/rails" >> ~/.bash_profile
-bash: tail: command not found
-bash: sed: command not found
Thanks,