Question : Problem: how to create a user with power user permisions

how to create a user with power user permisions like to create a directory , delete a directory by the user and to execute the any commands and install the  basic sofware.

Answer : Problem: how to create a user with power user permisions

Basically, you need to add the user in wheel group. Use the following command:
usermod -G wheel (You must be logged in as root)
Then use the 'su' command.

OR, you can use the 'sudo' command.
(only users listed in the /etc/sudoers configuration file are allowed to use the sudo command)

Please find the details here:
http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/security-guide/s1-wstation-privileges.html
(Section 4.4.3)
I hope you will find it useful. Thanks