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Most (all?) commands under /sbin are executable by anybody, but many can't be used to their full potential UNLESS you are root. e.g., a normal user can certainly run /sbin/ifconfig and get a display describing the current setup. But I doubt a normal user could invoke ifconfig to bring an interface down (I haven't tried this as a normal user, but I'll bet it won't work!)
Other commands, /sbin/iptables --list for example, are certainly executable by anyone, but they error out unless you are root.
There are reasons why root is the only user allowed to run certain commands. I wouldn't go mucking with that setup if I were you. Use sudo or su ... that's the correct way to do this.
>Is it possible to copy ifconfig and put it somewhere else?
Hehe..that is funny.
ifconfig is a command that comes under the /sbin directory. You can say s-bin stands for system-bin...meaning this folder has special commands which are critical for the "system". Commands in /bin can be run by all, but not the ones in /sbin.
Anyone can always run /sbin/ifconfig and almost all other programs in /sbin. They can always run ifconfig to display the status of any/all interfaces; but the system won't allow non-root users activate/deactivate or change settings for interfaces. This has nothing to do with the /sbin/ifconfig program itself.