Running jekyll -v, on the command line, resulted in the following message:
-bash: /usr/local/bin/jekyll: /usr/bin/ruby2.5: bad interpreter: No such file or directory
After some research, I found that I could run the following command:
which resulted in the following message:
I hope this post saves someone else some time.
Besides the above, I also made changes to my .bashrc , before Jekyll could work.
If you find it helpful, you may add the following two lines to your file located at ~/.bashrc :
Replace your_username (in the above two lines) with your user-name, of course.