Install Colorls on macOS and zsh - ruby

Question

I want to install Colorls. I am completely new to Ruby. To install Colorls I executed:
gem install colorls --user-install
After I while (maybe after I installed Anaconda) Colorls is not working anymore.
zsh: command not found: colorls
Here's some info:
RubyGems Environment:
- RUBYGEMS VERSION: 3.0.2
- RUBY VERSION: 2.6.1 (2019-01-30 patchlevel 33) [x86_64-darwin18]
- INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/2.6.0
- USER INSTALLATION DIRECTORY: /Users/matteo/.gem/ruby/2.6.0
- RUBY EXECUTABLE: /usr/local/opt/ruby/bin/ruby
- GIT EXECUTABLE: /usr/bin/git
- EXECUTABLE DIRECTORY: /usr/local/lib/ruby/gems/2.6.0/bin
- SPEC CACHE DIRECTORY: /Users/matteo/.gem/specs
- SYSTEM CONFIGURATION DIRECTORY: /usr/local/Cellar/ruby/2.6.1/etc
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-darwin-18
- GEM PATHS:
- /usr/local/lib/ruby/gems/2.6.0
- /Users/matteo/.gem/ruby/2.6.0
- /usr/local/Cellar/ruby/2.6.1/lib/ruby/gems/2.6.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- https://rubygems.org/
- SHELL PATH:
- /usr/local/Cellar/ruby/2.6.1/lib/ruby/gems/2.6.0
- /Users/matteo/.gem/ruby/2.6.0
- /usr/local/lib/ruby/gems/2.6.0
- /usr/local/lib/ruby/gems/2.6.0
- /usr/local/opt/ruby/bin
- /Users/matteo/bin
- /usr/local/bin
- /sbin
- /usr/sbin
- /usr/local/bin
- /usr/bin
- /bin
- /usr/sbin
- /sbin
- /Library/TeX/texbin

Answer 1

I always forget how to install colorls when I reformat my Mac.
I have:
macOS Catalina Version 10.15.7 (don't miss with the preinstalled ruby)
I follow these steps:
Step -1-
Install ruby using homebrew
brew install ruby
Step -2-
Go to the directory
cd /usr/local/Celler/ruby/<x.x.x>/bin
# Or for ARM Mac I use here 3.1.1 that comes with brew install ruby
cd /opt/homebrew/Cellar/ruby/3.1.1/bin
# Then
./gem install colorls
my version is (3.0.1)
Step -3-
Now you are ready to link this library to the default one you installed before (following the GitHub repo steps of the colorls)
ln -s /usr/local/lib/ruby/gems/x.x.x/bin/colorls /usr/local/bin/colorls
# or for ARM Mac I use here gem 3.1.0
ln -s /opt/homebrew/lib/ruby/gems/3.1.0/bin/colorls /usr/local/bin/colorls
Hint: if you find any other colorls in the directory prior to executing the link command just remove it.
now check:

Answer 2

Is it possible your ruby version doesn't match gem version? Seems like minor version in
/usr/local/Cellar/ruby/2.6.1/lib/ruby/gems/2.6.0
Make sure you still have the gem installed:
which colorls
#should output something like: /Users/yourusername/.rvm/gems/ruby-2.6.0/bin/colorls
See if the gem is indeed installed
gem list colorls
Then maybe try reinstall see https://github.com/athityakumar/colorls#install
You might wanna use a version manager, I recommend RVM see https://rvm.io/rvm/install