Public bug reported:
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)
** Affects: coreutils (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
** Attachment added: "GNU Bash(1) script to show various differing behaviours
(--help for summary)"
https://bugs.launchpad.net/bugs/1902311/+attachment/5429603/+files/sha-sum-chk.sh
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https://bugs.launchpad.net/bugs/1902311
Title:
GNU sha256(1) &tc --check (-c) output depends on order of --quiet and
--warn
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