I was always curious to understand the contents of the output of df -h command on my debian system. Here is the output:
debian:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda1 241M 201M 28M 88% /
tmpfs 234M 0 234M 0% /lib/init/rw
udev 10M 32K 10M 1% /dev
tmpfs 234M 0 234M 0% /dev/shm
I can understand the first line (/dev/hda1) which basically tells me the size of my debian system. What are the rest of the lines? tmpfs, udev,etc?