I could select an xfce session every time I log in, but that would make me crazy. I want xfce to be the default. It turns out this is extremely easy. This is on a Fedora 17 system by the way.
sudo yum install switchdesktop switchdesktop xfceThere is also a switchdesktop-gui package you could install. /bin/switchdesktop is a fairly straightforward shell script that you could examine if curious.
This would also be just the thing if you wanted to abandon gnome for xfce or some other desktop environment of your choosing.
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