Where Online Learning is simpler!

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

Filesystem     1K-blocks  Used Available Use% Mounted on
tmpfs           12182496   168  12182328   1% /dev/shm
tmpfs            2436500  1576   2434924   1% /run
tmpfs               5120     8      5112   1% /run/lock
tmpfs            2436496   108   2436388   1% /run/user/131