Starting with OS X Sierra if you've noticed that the fonts are rather thin in Atom or other Electron based apps, the reason was that subpixel antialiasing is turned off in the OS defaults even though it's enabled globally through the Preferences Menu.
defaults write -g CGFontRenderingFontSmoothingDisabled -bool NO
And restart Atom or logout and login for the setting to take effect.
Anyone with some familiarity with unix filesystems will recognize the file permissions like
-rw-r--r--. However, you will also notice a “+” and “@” symbol appearing to the right of the permission tables of some of the files. What are these? They are called extended file attributes.
This note explains the extended file attributes. Thanks to original poster. What Is The Significance Of “+” And “@” In Mac OS X File Permission Tables