I have just installed gnome user interface on my CentOS 7 but didn't install gnome terminal. Now there isn't any other app installed than nautilus file manager and control-center. What do I do?
If you started with the minimal installation of CentOS 7 you need to do the following to enable the Desktop:
$ sudo yum groupinstall "GNOME Desktop" "Graphical Administration Tools"
Then set the default run level to 5 (X windows)
$ sudo ln -sf /lib/systemd/system/runlevel5.target \ /etc/systemd/system/default.target
This step can be done more succinctly using systemd:
$ sudo systemctl set-default graphical.target
What if I'm locked in GNOME?
If you're somehow logged into GNOME desktop but find yourself unable to get to a
gnome-terminal or any terminal for that matter, you can always reboot the system into runlevel 3 (multi-user with networking, no desktop).
While at the GRUB prompt, edit the kernel entry that's going to boot by hitting the letter e. Then go to the line that starts with the string
linux and go to the end of this line and type the number
NOTE: Then hit F10 or Ctrl + X.
From this point you'll be able to log into your system in console mode, run your
yum commands to install what I mentioned above and then reboot the system.