Show information of directory or disk

There are so many commands of Ubuntu, we just need to know useful and high-frequency commands. I have collected a little common commands which may be  useful for you in the future.

Check the size of directory

sudo df -h #show the current info of partitions
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda2        40G  2.9G   35G   8% /
udev            2.0G  4.0K  2.0G   1% /dev
tmpfs           790M  864K  789M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            2.0G  152K  2.0G   1% /run/shm
none            100M   40K  100M   1% /run/user

sudo du /home/pinxiong/ --max-depth=1 -h #show the first-level sub-directory info in directory '/home/pinxiong'
4.0K    /home/pinxiong/Templates
43M    /home/pinxiong/.mozilla
4.0K    /home/pinxiong/Pictures
32K    /home/pinxiong/.gconf
32K    /home/pinxiong/.pulse
4.0K    /home/pinxiong/Downloads
12K    /home/pinxiong/.mission-control
444K    /home/pinxiong/.local
120K    /home/pinxiong/.config
4.0K    /home/pinxiong/Public
4.0K    /home/pinxiong/Videos
4.0K    /home/pinxiong/Documents
12K    /home/pinxiong/.dbus
716K    /home/pinxiong/.cache
4.0K    /home/pinxiong/Music
4.0K    /home/pinxiong/Desktop
8.0K    /home/pinxiong/.gnome2
44M    /home/pinxiong/

sudo du /home/pinxiong/ -sh #show the size of directory '/home/pinxiong'
44M    /home/pinxiong/