Why does sum command not show a file name with BSD mode option?

Solution Verified - Updated -

Issue

  • Why does sum command not show a file name with BSD mode option?
    For example,
- BSD mode
# sum install.log
55757    51

- SysV mode
# sum -s install.log
60946 102 install.log

Environment

  • Red Hat Enterprise Linux 6
  • sum command in coreutils package

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