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Calculate the total disk space used by a list of files or directories

 $ du -s file1 dir1 | awk '{sum += $1} END {print sum}'

— by Janos on Dec. 28, 2011, 8:42 p.m.

Explanation

  • This is really simple, the first column is the size of the file or the directory, which we sum up with awk and print the sum at the end.
  • Use du -sk to count in kilobytes, du -sm to count in megabytes (not available in some systems)