Where Online Learning is simpler!

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

Filesystem     1K-blocks  Used Available Use% Mounted on
tmpfs           12182492   168  12182324   1% /dev/shm
tmpfs            2436500  1632   2434868   1% /run
tmpfs               5120     8      5112   1% /run/lock
tmpfs            2436496   112   2436384   1% /run/user/131