Working with Linux

ps aux: This prints all processes with PID
| grep nautilus: Find the ones matching nautilus
| grep -v grep: Inverts grep to exclude the grep process
| awk '{print $2}': Selects the second word in the line, which is the PID
| xargs kill: Here xargs is used to distribute each PID to a kill command. It is especially
used for commands that do not read arguments from standard input.
Now we've killed nautilus. This was purely a demonstrative example. There are other ways of
doing this.
Let's open nautilus again and send it to the background by hitting Ctrl + Z followed by the bg
command.
Now let's run the following command:
pgrep nautilus
To see all the pids of nautilus and to send the kill signal to all those processes, use the following
command line:
pkill nautilus
Now it's time for some networking! You probably know the ifconfig command, which is used to
print information about the network interfaces. To get the IP address of a specific interface (in our