Capitalize a variable in a shell script

[Diego Alencar Alves de Lima <diegolima.br@xxxxxxxxx>]

How can I capitalize an existing variable in a shell script? Currently 
$variable is www.domain.com, and I need to create a $variable1 that contains 
WWW.DOMAIN.COM (I am currently using bash as shell)

Thanks a lot
-- 
Diego Lima
http://sg.homelinux.com:81

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