Use full size of SD card?

Hi,

I just installed the system on a 32GB SD card on my nanopi neo air.

df shows only 3GB space available.. How can I use the whole SD card?

I found a command somewhere on the wiki when I did this few months ago..
but now I can't find it. :(

Thanks.

I found it!

the magical command is:
fs_resize

After the command and reboot I can use the whole SD card.