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The 
/usr/sbin
 directory may or may not be in your 
$PATH
 (a set of directories your 
shell looks within for commands), so if your system doesn't recognize 
ifconfig
, 
using the fully qualified command should produce the desired output, as follows:
Figure 10.4: Viewing interface information with the ifconfig command
Secondly, just like with the 
ip
 commands we practiced earlier, we can also bring an 
interface down or up with 
ifconfig
 as well:
sudo ifconfig enp0s3 down 
sudo ifconfig enp0s3 up 
There are, of course, other options and variations of 
ip
 and 
ifconfig
, so feel free to 
look up the man pages for either if you want more information. For the purposes of 
this section, the main thing is to remember how to view your current IP assignments, 
as well as how to bring an interface up or down.
As useful as our network interfaces can be, they're useless without an IP address 
assigned to them. While a network will often use DHCP to take care of this, in the 
next section we'll take a look at how to assign a static IP address.

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Chapter 10