In FC the /sbin folder is not in the path. To run configuration commands (like modprobe, ifconfig, iwconfig , etc) try prefixing them with
/sbin/ or
/usr/sbin
for example:
Code:
/sbin/init
or
/sbin/modprobe
Another alternative is adding sbin and /usr/sbin to the path.
I like NOT having the configuration commands in the path, those commands are not meant to be used constantly, just while you are configuring your system.