bin/bash: ruby command not found. Ruby not in sudo path

I have faced the same issue and fumbled to find an answer. here is how I solved it.

start the program with the following shibang line so that ubuntu knows it is a ruby file. #!/usr/bin/env ruby
change the directory to where your code lives cd /home/User1/program
make your file executable by running chmod +x your_program.rb
type in the terminal ruby your_program.rb notice the text "ruby"

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