How can you change the keyboard layout (to QWERTY from QWERTZ) on the fly from a Linux shell?
I found this similar question, but the answer was to edit a config file, which is not so easy when you're using a Live CD.
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Go in the menu and add your layout to keyboard:
System->Preferences->Keyboard, where choose Layouts tab and add your language (the default is the one chosen at installation time). Then you can press the Layout Options... button, and look in Key(s) to change layout for the hot keys that changes the Keyboard layout. For me it is Shift+Caps Lock.
Hope to help.
N.B. I'm running CentOS 6.2 with GNOME interface.