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| Chapter 2 UNIX Commands |

## du

    du [options] [directories]

Print disk usage; i.e., the number of 512-byte blocks used Print disk usage; i.e., the number of kilobytes used by each named directory and its subdirectories (default is current directory).

### Options

-a

  Print usage for all files, not just subdirectories.

-r

  Print "cannot open" message if a file or directory is inaccessible.

-s

  Print only the grand total for each named directory.

Reference: dpost |  | Reference: echo