Working with ATOM.io
When Atom installs it automatically creates a symlink in your /usr/local/bin. However if it hasn’t, you can create it on your Mac CLI (command line interface) by typing
ln -s /Applications/Atom.app/Contents/Resources/app/atom.sh /usr/local/bin/atom
Now you can use (atom folder_name) to open a folder and (atom file_name) to open a file.