Where Online Learning is simpler!

The output of your command "$ df -F tmpfs" is:

Filesystem     1K-blocks  Used Available Use% Mounted on
tmpfs            3169500  1776   3167724   1% /run
tmpfs            1584748   112   1584636   1% /run/user/1000
tmpfs            3169500  1776   3167724   1% /run/user
tmpfs            7923748 21328   7902420   1% /tmp
tmpfs               4096     0      4096   0% /dev
tmpfs            7923748     8   7923740   1% /dev/shm