Re: Piping to stdin

From	Phil Carmody <pc+usenet@asdf.org>
Newsgroups	comp.unix.programmer, comp.lang.c
Subject	Re: Piping to stdin
Date	2023-08-15 18:33 +0300
Organization	A noiseless patient Spider
Message-ID	<87bkf848xw.fsf@fatphil.org> (permalink)
References	(3 earlier) <20230813200644.979@kylheku.com> <ubc63c$3hlul$2@news.xmission.com> <ubdgcv$2carp$2@dont-email.me> <vo5rqj-lpl.ln1@paranoia.mcleod-schmidt.id.au> <ubg25m$2rr3g$1@dont-email.me>

Cross-posted to 2 groups.

Show all headers | View raw

kalevi@kolttonen.fi (Kalevi Kolttonen) writes:
> The "problem" of having '-' as a filename is
> a complete non-issue that only has theoretical
> interest. On Unix, no matter which stdin 
> convention you choose, you run the risk of 
> someone having that convention as a filename.

Not everything is a valid filename in unix. If you can exclude the
possibility of accepting a directory, then you could have adopted
something that could only be a directory as the placeholder, such as
'.', or '/', or '-/', or .... Ooof, technically you could use '',
as that's a forbidden filename too, but I'm not suggesting that.

> On Unix, it used to be the case that only
> NUL-characters and '/' were out of question. I
> suppose some filesystems place more restrictions
> on filenames nowadays.

There are many contexts where certain characters have special meanings,
and so it makes sense to avoid them in filenames (colons spring to mind,
but of course some shell characters). However, sense has never been a
proven property of the modern computer user. At least the order of
command processing is mostly sane, so that you can't use malicious
filenames to inject shell metacharacters into commandlines, it's only
the programs being executed that could get confused by what they
receive.

Phil
-- 
We are no longer hunters and nomads. No longer awed and frightened, as we have
gained some understanding of the world in which we live. As such, we can cast
aside childish remnants from the dawn of our civilization.
-- NotSanguine on SoylentNews, after Eugen Weber in /The Western Tradition/

Back to comp.unix.programmer | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Re: Piping to stdin Spiros Bousbouras <spibou@gmail.com> - 2023-08-13 13:55 +0000
  Re: Piping to stdin Spiros Bousbouras <spibou@gmail.com> - 2023-08-13 14:27 +0000
    Re: Piping to stdin gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-14 00:59 +0000
      Re: Piping to stdin Kaz Kylheku <864-117-4973@kylheku.com> - 2023-08-14 03:07 +0000
        Re: Piping to stdin gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-14 03:12 +0000
          Re: Piping to stdin kalevi@kolttonen.fi (Kalevi Kolttonen) - 2023-08-14 15:14 +0000
            Re: Piping to stdin "Gary R. Schmidt" <grschmidt@acm.org> - 2023-08-15 12:50 +1000
              Re: Piping to stdin Kaz Kylheku <864-117-4973@kylheku.com> - 2023-08-15 04:59 +0000
                Re: Piping to stdin Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-08-14 23:15 -0700
                Re: Piping to stdin Richard Kettlewell <invalid@invalid.invalid> - 2023-08-15 08:50 +0100
                Dealing with weird filenames (Was: Piping to stdin) gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-15 08:10 +0000
                Re: Piping to stdin David Brown <david.brown@hesbynett.no> - 2023-08-15 15:34 +0200
                Re: Piping to stdin Richard Harnden <richard.nospam@gmail.com> - 2023-08-15 19:50 +0100
                Re: Piping to stdin scott@slp53.sl.home (Scott Lurndal) - 2023-08-15 20:16 +0000
                Re: Piping to stdin vallor <vallor@cultnix.org> - 2023-08-16 06:34 +0000
                Re: Piping to stdin Richard Kettlewell <invalid@invalid.invalid> - 2023-08-16 17:39 +0100
                Re: Piping to stdin scott@slp53.sl.home (Scott Lurndal) - 2023-08-16 17:37 +0000
                Re: Piping to stdin gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-16 17:43 +0000
                Re: Piping to stdin Spiros Bousbouras <spibou@gmail.com> - 2023-08-16 19:22 +0000
                Re: Piping to stdin Kaz Kylheku <864-117-4973@kylheku.com> - 2023-08-16 20:10 +0000
                Re: Piping to stdin Kaz Kylheku <864-117-4973@kylheku.com> - 2023-08-16 20:11 +0000
                Re: Piping to stdin Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-08-16 13:35 -0700
                Re: Piping to stdin Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2023-08-17 13:34 +0100
                Re: Piping to stdin Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-08-17 14:27 -0700
                Re: Piping to stdin Phil Carmody <pc+usenet@asdf.org> - 2023-08-17 14:51 +0300
                Re: Piping to stdin James Kuyper <jameskuyper@alumni.caltech.edu> - 2023-08-16 01:37 -0400
                Re: Piping to stdin David Brown <david.brown@hesbynett.no> - 2023-08-16 13:14 +0200
                Re: Piping to stdin Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2023-08-15 12:08 -0600
                Re: Piping to stdin Richard Harnden <richard.nospam@gmail.com> - 2023-08-16 09:32 +0100
                Re: Piping to stdin Phil Carmody <pc+usenet@asdf.org> - 2023-08-16 17:27 +0300
              Re: Piping to stdin kalevi@kolttonen.fi (Kalevi Kolttonen) - 2023-08-15 14:30 +0000
                Re: Piping to stdin Giovanni <lsodgf0@home.net.it> - 2023-08-15 17:14 +0200
                Re: Piping to stdin gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-15 15:48 +0000
                Re: Piping to stdin kalevi@kolttonen.fi (Kalevi Kolttonen) - 2023-08-15 16:12 +0000
                Re: Piping to stdin Muttley@dastardlyhq.com - 2023-08-15 16:15 +0000
                Re: Piping to stdin kalevi@kolttonen.fi (Kalevi Kolttonen) - 2023-08-15 16:22 +0000
                Re: Piping to stdin Muttley@dastardlyhq.com - 2023-08-17 10:26 +0000
                Re: Piping to stdin kalevi@kolttonen.fi (Kalevi Kolttonen) - 2023-08-17 14:23 +0000
                Re: Piping to stdin scott@slp53.sl.home (Scott Lurndal) - 2023-08-17 15:25 +0000
                Re: Piping to stdin Kaz Kylheku <864-117-4973@kylheku.com> - 2023-08-15 17:33 +0000
                Re: Piping to stdin Phil Carmody <pc+usenet@asdf.org> - 2023-08-15 23:32 +0300
                Re: Piping to stdin Muttley@dastardlyhq.com - 2023-08-17 10:32 +0000
                Re: Piping to stdin Phil Carmody <pc+usenet@asdf.org> - 2023-08-17 14:57 +0300
                Re: Piping to stdin Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2023-08-17 13:49 +0100
                Re: Piping to stdin Muttley@dastardlyhq.com - 2023-08-17 15:15 +0000
                Wrecking a good thing? (Was: Piping to stdin) gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-17 14:09 +0000
                Re: Wrecking a good thing? Phil Carmody <pc+usenet@asdf.org> - 2023-08-18 00:39 +0300
                Re: Wrecking a good thing? (Was: Piping to stdin) David Brown <david.brown@hesbynett.no> - 2023-08-18 11:17 +0200
                Re: Piping to stdin Muttley@dastardlyhq.com - 2023-08-17 15:14 +0000
                Re: Piping to stdin Kaz Kylheku <864-117-4973@kylheku.com> - 2023-08-17 13:52 +0000
                Re: Piping to stdin Muttley@dastardlyhq.com - 2023-08-17 15:20 +0000
                Re: Piping to stdin Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-08-17 13:43 -0700
                Re: Piping to stdin David Brown <david.brown@hesbynett.no> - 2023-08-18 11:28 +0200
                Re: Piping to stdin Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-08-17 21:52 +0100
                Re: Piping to stdin Phil Carmody <pc+usenet@asdf.org> - 2023-08-19 13:33 +0300
                Re: Piping to stdin Oğuz <oguzismailuysal@gmail.com> - 2023-08-19 16:15 +0300
                Re: Piping to stdin Muttley@dastardlyhq.com - 2023-08-19 14:48 +0000
                Re: Piping to stdin scott@slp53.sl.home (Scott Lurndal) - 2023-08-20 17:24 +0000
                Re: Piping to stdin Muttley@dastardlyhq.com - 2023-08-20 19:21 +0000
                Re: Piping to stdin Rainer Weikusat <rweikusat@talktalk.net> - 2023-08-20 21:57 +0100
                What language is this? (Was: Piping to stdin) gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-20 22:33 +0000
                Re: What language is this? (Was: Piping to stdin) scott@slp53.sl.home (Scott Lurndal) - 2023-08-21 01:26 +0000
                Re: What language is this? (Was: Piping to stdin) gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-21 02:57 +0000
                Re: What language is this? Rainer Weikusat <rweikusat@talktalk.net> - 2023-08-21 17:16 +0100
                Re: What language is this? gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-21 19:10 +0000
                Re: What language is this? Rainer Weikusat <rweikusat@talktalk.net> - 2023-08-21 20:31 +0100
                Re: What language is this? gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-21 20:29 +0000
                Re: What language is this? Rainer Weikusat <rweikusat@talktalk.net> - 2023-08-21 21:48 +0100
                Re: What language is this? (Was: Piping to stdin) Muttley@dastardlyhq.com - 2023-08-21 06:50 +0000
                Re: Piping to stdin Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-08-19 21:14 +0100
                Re: Piping to stdin kalevi@kolttonen.fi (Kalevi Kolttonen) - 2023-08-20 02:02 +0000
                Re: Piping to stdin Phil Carmody <pc+usenet@asdf.org> - 2023-08-15 23:24 +0300
                Re: Piping to stdin Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2023-08-15 20:50 +0000
                Re: Piping to stdin Phil Carmody <pc+usenet@asdf.org> - 2023-08-16 17:11 +0300
                Re: Piping to stdin Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2023-08-16 15:25 +0000
                Re: Piping to stdin Kaz Kylheku <864-117-4973@kylheku.com> - 2023-08-16 19:29 +0000
                Re: Piping to stdin Phil Carmody <pc+usenet@asdf.org> - 2023-08-17 14:49 +0300
                Re: Piping to stdin Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-08-16 03:20 +0100
                Re: Piping to stdin Phil Carmody <pc+usenet@asdf.org> - 2023-08-15 18:33 +0300
      Re: Piping to stdin "Nuno Silva" <nunojsilva@invalid.invalid> - 2023-08-14 09:45 +0100
  Re: Piping to stdin Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2023-08-13 21:26 -0600
    Re: Piping to stdin Spiros Bousbouras <spibou@gmail.com> - 2023-08-14 09:24 +0000
      Re: Piping to stdin Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-08-14 11:29 +0100
        Re: Piping to stdin gazelle@shell.xmission.com (Kenny McCormack) - 2023-08-14 11:28 +0000
          Re: Piping to stdin scott@slp53.sl.home (Scott Lurndal) - 2023-08-14 15:41 +0000
            Re: Piping to stdin Richard Harnden <richard.nospam@gmail.com> - 2023-08-14 22:02 +0100
              Re: Piping to stdin scott@slp53.sl.home (Scott Lurndal) - 2023-08-14 21:14 +0000

csiph-web