bug#61530: sha256sum check single file in a mutiple sha sum text file

[Andreas Löw]

   Hello,

   I want to check a single file for correct sha256. All the files of my
   directory are included in a sha256 text file named allsha256.

   The sha256sum always checks all files included in the allsha256 file,
   even if I write:

   sha256sum myfile -c allsha256

   It reports a warning 'no correct formatted line was found for myfile'
   and later it reports 'myfile OK'

   Regards,
   Andreas