How to assign user root rights?

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http://unix.stackexchange.com – I have Suse Linux on my desktop. So I am root and "normal" user. Frequently e.g. to start tomcat or install/remove a program I should use sudo or switch to super user. But I have defined many aliases in .bashrc, path in .profile etc. Is it possible to assign to normal user some rights of super user? E.g. to install program? (HowTos)