What does this command do? (3.1, Step 4)

jtillinghast

Can someone please explain what this command is doing?

'echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null'

Thanks!

chrispokorni

Hi @jtillinghast,

The second command in lab 3.1 step 12:

echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] \
https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

adds the Docker repository to the apt (Ubuntu package manager) sources, to allow the containerd.io package to be installed on step 13.

Regards,
-Chris

jtillinghast

Thanks, Chris. I think I get most of the components of the command, but why pipe output to /dev/null? Is that just to suppress output?

chrispokorni

Hi @jtillinghast,

Is that just to suppress output?

Yes.

Regards,
-Chris