[Bug 1902311] Re: GNU sha256sum(1) &tc --check (-c) output depends on order of --quiet and --warn

[Brian Foster]

** Summary changed:

- GNU sha256(1) &tc --check (-c) output depends on order of --quiet and --warn
+ GNU sha256sum(1) &tc --check (-c) output depends on order of --quiet and --warn

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Title:
  GNU sha256sum(1) &tc --check (-c) output depends on order of --quiet
  and --warn

Status in coreutils package in Ubuntu:
  Confirmed

Bug description:
  The output of GNU sha256sum --check (or -c), and related tools (i.e., sha1sum,
  sha224sum, sha384sum, and sha512sum) depends on the order of the --quiet and
  --warn options.  This is counter-intuitive, not documented in the man(1) pages,
  and unnecessary.

  Simple example:

    1$ date >/tmp/data
    2$ sha256sum /tmp/data >/tmp/sums
    3$ sha256sum -c --warn --quiet /tmp/sums    # No output (expected)
    4$ sha256sum -c --quiet --warn /tmp/sums    # Unexpected "Ok"...
    /tmp/data: OK
    5$ 

  The manual page says (spurious lines omitted):

     The following five options are useful only when verifying checksums:
       --quiet       don't print OK for each successfully verified file
       -w, --warn    warn about improperly formatted checksum lines

  There is no reason --warn should affect the operation of --quiet (nor
  visa-versa).  The operations as documented are orthogonal.

  Attached is a bash(1) shell script written when puzzling over this
  inconsistent behaviour; it may be useful (use --help for a summary).

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: coreutils 8.30-3ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Fri Oct 30 21:34:31 2020
  InstallationDate: Installed on 2020-10-19 (11 days ago)
  InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: coreutils
  UpgradeStatus: No upgrade log present (probably fresh install)

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