gemspec

# ...

spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }

output

sock_admin (master) ✗ thor_admin                                                                                                            
zsh: command not found: thor_admin

Successfully uninstalled sock_admin-0.0.3
Remove executables:
  sock_admin

in addition to the gem? [Yn]  y


sock_admin (master) ✗ ls bin                                                                                                                
sock_admin thor_admin

thor_admin

#!/usr/bin/ruby

require 'thor'
require 'sock_admin'

module SockAdmin
  class CLI < Thor
    # ...
  end
end
SockAdmin::CLI.start