I am trying to list the files only with the letter \"R\" at the end. I used find as follows in macOS Terminal,
find
find -type f -name \'*R\'
The first argument to find is the path where it should start looking. The path . means the current directory.
.
find . -type f -name '*R'
You must provide at least one path, but you can actually provide as many as you want:
find ~/Documents ~/Library -type f -name '*R'