Disk-Used and Disk-Free (du, df, quota)

du: Diskspace Used.

Summarize disk usage of each FILE, recursively for directories.


Options:

    -b, --bytes : print size in bytes
      
    -x, --one-file-system : skip directories on different filesystems

Examples:
  
   du --exclude='*.o'

   du -b -x | sort -nr | more

df: Diskspace Free.

Report filesystem disk space usage


Example:

> df

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda3             16516084   7733824   7943268  50% /
/dev/hda1                38859      4641     32212  13% /boot
/dev/hda5             22144888    518836  21626052   3% /home
shmfs                   257560         0    257560   0% /dev/shm
/dev/sr1                  4166      4166         0 100% /media/cdrom

quota: Display disk usage and limits.

By default only the user's quotas are printed.