In case you encounter the following error using SVN — on my Mac, for me:
svn: E205007: Could not use external editor to fetch log message; consider setting the $SVN_EDITOR environment variable or using the –message (-m) or –file (-F) options
svn: E205007: None of the environment variables SVN_EDITOR, VISUAL or EDITOR are set, and no ‘editor-cmd’ run-time configuration option was found
Just run the following in your terminal and all will be good:
Note: You can use "nano" or whatever editor you’d like.