Check your Disk Usage on Ubuntu from the command line
Ubuntu Linux, like all unix varieties, includes the du command line utility. du stands for Disk Usage, as I’m sure you assumed.
Go ahead, just type the command in your home directory:
geek@ubuntu-desktop:~$ du
8 ./.gconf/desktop/gnome/accessibility/keyboard
12 ./.gconf/desktop/gnome/accessibility
8 ./.gconf/desktop/gnome/screen/default/0
12 ./.gconf/desktop/gnome/screen/default
16 ./.gconf/desktop/gnome/screen
8 ./.gconf/desktop/gnome/font_rendering
40 ./.gconf/desktop/gnome
44 ./.gconf/desktop
8 ./.gconf/apps/panel/applets/clock_screen0/prefs
16 ./.gconf/apps/panel/applets/clock_screen0
8 ./.gconf/apps/panel/applets/trashapplet_screen0
8 ./.gconf/apps/panel/applets/workspace_switcher_screen0/prefs
16 ./.gconf/apps/panel/applets/workspace_switcher_screen0
It shows you a very verbose output by default, which isn’t always extremely useful. Thankfully it also includes a lot of extra options.
To find the total size of files and folders in our current directory, listed by MB:
geek@ubuntu-desktop:~$ du -s -m *
1 Desktop
0 Examples
17 VMwareTools-5.5.2-29772.tar.gz
Now we are getting somewhere. That’s some pretty useful output.

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Add command df -h for checking partition usage
try:
df -h
“du|grep something” will search the system from the current directory down for a file/directory called “something”.
try
du -sh *
it would give output in user readable format like 57K 3.6M 1.5G, hope it helps.