no comands (shotdown, fdisk) executable with root (fedora8, kde 3.5)
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You've probably just run 'su' to log in as root. This doesn't read the bash profile settings in the /root directory. Use 'su -' instead, and you'll log in a a proper root (i.e. with /sbin and /usr/sbin in your path).
The environment is not set to that of the new user. Therefore you don't have the PATH variable set to include certain directories and hence the programs can not be found. With su -, the environment is set to that of the new user.