du [options] [directories]
Print disk usage (as the number of 1 KB blocks used by each named directory and its subdirectories; default is the current directory).
End output lines with null, not newline.
Print disk usage for all files, not just subdirectories.
Print the apparent sizes, not disk usage.
df [options] [name]
Report the amount of free disk space available on all mounted filesystems or on the given name. (df cannot report on unmounted
filesystems.) Disk space is shown in 1 KB blocks (default) or 512- byte blocks if the environment variable POSIXLY_CORRECT is set.
name can be a device name (e.g., /dev/hd*), the directory name of a mounting point (e.g., /usr), or a directory name (in which case df reports on the entire filesystem in which that directory is mounted).
df -i Show free inodes on mounted filesystems
df -h Show free space on mounted filesystems