Why does du command shows greater size than total size of each file in directory?

Solution Unverified - Updated -

Issue

  • Why does a du command shows greater size than a total size of each file in a directory?
# du -sh dir1
48M   dir1
# du -sh dir1/*
4.0K  /dir1/file1
4.0K  /dir1/file2
4.0K  /dir1/file3

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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