How do linux/aix use commands to view the size of a directory's footprint?

The purpose of this article is to decide which directory space occupies the most files when disk space is full, so as to analyze the reasons for the lack of space

1, to Xshell or other terminal software through SSH or Telnet login to see the system host

2, through DF-HL (Linux) or Df-g (AIX) to view the overall space occupancy, the most location of the directory

3, then enter this subdirectory, the implementation of Du-ks |sort-rn |more according to space use from large to small display subdirectory space

Note:

Sometimes the lack of space may be due to a large number of files, but also may be too many files, at this time, will also cause new files can not write, at this time need to use Df-ih to view the number of files occupied.