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 Documented in Volume 1 of the UNIX Programmers Manual.

 % du
  starting at the current directory, will recursively list by directory the
  number of disk blocks used by each.

 % du -s
  shows only the TOTAL disk usage in blocks starting at the current directory.

 % du -a | sort -nr | more
  starting at the current directory, list the size and name of each file
  (-a), then sort by value (-n) the initial numeric string, in descending
  sequence (-r). This is good for file housekeeping.

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