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Have you tried it in Linux ? Emojis are not available there.

That depends on your distro. Fedora 27 just shipped recently with colored emoji support thanks to the Google noto emoji font.

I shipped my distro (Happy Hacking Linux) with emoji fonts a year before Fedora. That font is useful only for GUI apps, won't work in CLI.

It absolutely works in gnome-terminal on GNOME 3.26.