Re: sha256sum --text generating blank spaces and hyphens?

From	"Thomas Schmitt" <scdbackup@gmx.net>
Newsgroups	linux.debian.user
Subject	Re: sha256sum --text generating blank spaces and hyphens?
Date	2023-04-26 17:10 +0200
Message-ID	<GoOWl-4Gkd-11@gated-at.bofh.it> (permalink)
References	<GoOtj-4FTJ-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi,

Albretch Mueller wrote:
> > >  I am trying to avoid funky characters and sha256sum --text still
> > > generates them!?!

Andy Smith wrote:
> > If you're referring to the space and then the file name ("-" in case
> > of stdin) on the end, you can just select only the first output up
> > to whitespace with e.g. awk:

> Yes, you could but I am trying to find out why this is happening
> instead of truncating the string when a space appears because I don't
> think what would be safe.

One of the blanks and the hyphen-or-minus are announced by the man page:

  The default mode is
  to print a line with checksum, a character indicating input  mode  ('*'
  for binary, space for text), and name for each FILE.

"FILE" is the minus-sign for standard input. The second blank is there
to indicate the text mode of sha256sum.
Only the first blank is somewhat puzzling. But it's always there.

  https://www.gnu.org/software/coreutils/manual/html_node/sha2-utilities#sha2-utilities
points to
  https://www.gnu.org/software/coreutils/manual/html_node/md5sum-invocation.html
which says
  For each file, ‘md5sum’ outputs by default, the MD5 checksum, a space,
  a flag indicating binary or text input mode, and the file name. Binary
  mode is indicated with ‘*’, text mode with ‘ ’ (space). Binary mode is
  the default on systems where it’s significant, otherwise text mode is
  the default. The cksum command always uses binary mode and a ‘ ’
  (space) flag.

So the first blank can be relied on and thus the proposal by Andy Smith
to use "awk '{print $1}'" is valid.

Have a nice day :)

Thomas

Thread

sha256sum --text generating blank spaces and hyphens? Albretch Mueller <lbrtchx@gmail.com> - 2023-04-26 09:50 +0200
  Re: sha256sum --text generating blank spaces and hyphens? <tomas@tuxteam.de> - 2023-04-26 10:20 +0200
    Re: sha256sum --text generating blank spaces and hyphens? Albretch Mueller <lbrtchx@gmail.com> - 2023-04-26 16:40 +0200
      Re: sha256sum --text generating blank spaces and hyphens? Nicolas George <george@nsup.org> - 2023-04-26 16:50 +0200
        Re: sha256sum --text generating blank spaces and hyphens? Max Nikulin <manikulin@gmail.com> - 2023-04-28 04:30 +0200
          Re: sha256sum --text generating blank spaces and hyphens? Nicolas George <george@nsup.org> - 2023-04-28 10:10 +0200
            Re: sha256sum --text generating blank spaces and hyphens? Max Nikulin <manikulin@gmail.com> - 2023-04-28 18:50 +0200
              Re: sha256sum --text generating blank spaces and hyphens? Nicolas George <george@nsup.org> - 2023-04-29 11:00 +0200
                Re: sha256sum --text generating blank spaces and hyphens? Max Nikulin <manikulin@gmail.com> - 2023-04-29 14:20 +0200
                Re: sha256sum --text generating blank spaces and hyphens? Nicolas George <george@nsup.org> - 2023-04-29 14:30 +0200
      Re: sha256sum --text generating blank spaces and hyphens? Dan Ritter <dsr@randomstring.org> - 2023-04-26 17:10 +0200
      Re: sha256sum --text generating blank spaces and hyphens? David Wright <deblis@lionunicorn.co.uk> - 2023-04-26 17:10 +0200
      Re: sha256sum --text generating blank spaces and hyphens? "Thomas Schmitt" <scdbackup@gmx.net> - 2023-04-26 17:10 +0200
      Re: sha256sum --text generating blank spaces and hyphens? <tomas@tuxteam.de> - 2023-04-26 19:00 +0200
        Re: sha256sum --text generating blank spaces and hyphens? Albretch Mueller <lbrtchx@gmail.com> - 2023-04-26 22:40 +0200
          Re: sha256sum --text generating blank spaces and hyphens? Albretch Mueller <lbrtchx@gmail.com> - 2023-04-26 23:10 +0200
          Re: sha256sum --text generating blank spaces and hyphens? Andy Smith <andy@strugglers.net> - 2023-04-26 23:50 +0200
  Re: sha256sum --text generating blank spaces and hyphens? Andy Smith <andy@strugglers.net> - 2023-04-26 12:50 +0200
  Re: sha256sum --text generating blank spaces and hyphens? Jeffrey Walton <noloader@gmail.com> - 2023-04-26 18:00 +0200
  Re: sha256sum --text generating blank spaces and hyphens? David Christensen <dpchrist@holgerdanske.com> - 2023-04-27 00:50 +0200
    Re: sha256sum --text generating blank spaces and hyphens? Nicolas George <george@nsup.org> - 2023-04-27 00:50 +0200
      Re: sha256sum --text generating blank spaces and hyphens? David Christensen <dpchrist@holgerdanske.com> - 2023-04-27 06:10 +0200
        Re: sha256sum --text generating blank spaces and hyphens? Max Nikulin <manikulin@gmail.com> - 2023-04-27 08:00 +0200
          Re: sha256sum --text generating blank spaces and hyphens? Albretch Mueller <lbrtchx@gmail.com> - 2023-04-27 09:30 +0200
        Re: sha256sum --text generating blank spaces and hyphens? Nicolas George <george@nsup.org> - 2023-04-27 10:10 +0200
          Re: sha256sum --text generating blank spaces and hyphens? David Christensen <dpchrist@holgerdanske.com> - 2023-04-27 17:20 +0200
            Re: sha256sum --text generating blank spaces and hyphens? Albretch Mueller <lbrtchx@gmail.com> - 2023-05-02 02:10 +0200
    Re: sha256sum --text generating blank spaces and hyphens? Albretch Mueller <lbrtchx@gmail.com> - 2023-04-27 01:30 +0200
      Re: sha256sum --text generating blank spaces and hyphens? David Christensen <dpchrist@holgerdanske.com> - 2023-04-27 06:30 +0200

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