Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.008 X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'interpreter': 0.05; 'affected': 0.07; 'interpreter.': 0.07; 'subject:form': 0.07; 'subject:missing': 0.07; 'scripting': 0.09; 'command-line': 0.16; 'descriptors': 0.16; 'descriptors.': 0.16; 'fd,': 0.16; 'finds': 0.16; 'fork': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'lang': 0.16; 'line);': 0.16; 'stuff.': 0.16; 'subject:key': 0.16; 'variant,': 0.16; 'wrote:': 0.18; 'examples': 0.20; 'command': 0.22; 'shell': 0.22; '(or': 0.24; 'script': 0.25; 'handling': 0.26; 'pass': 0.26; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'unix': 0.29; 'message-id:@mail.gmail.com': 0.30; 'obscure': 0.31; 'sep': 0.31; 'file': 0.32; 'probably': 0.32; 'stuff': 0.32; 'fri,': 0.33; 'agree': 0.35; 'common': 0.35; 'except': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'really': 0.36; 'done': 0.36; 'subject:?': 0.36; 'should': 0.36; 'two': 0.37; 'sometimes': 0.38; 'security,': 0.38; 'to:addr :python-list': 0.38; 'does': 0.39; 'though,': 0.39; 'to:addr:python.org': 0.39; 'advanced': 0.63; 'more': 0.64; 'between': 0.67; 'nobody': 0.68; 'home': 0.69; 'programs,': 0.74; 'special': 0.74; 'common,': 0.84; 'env': 0.84; 'edwards': 0.91; 'vars': 0.91; '2013': 0.98 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=SGhFgkUfZ0FyC0ofrhXnxonm3iNydkyLhLucseeyI/0=; b=whi2kNJN7wnvCtcjGM7RC7VdMrCmvzoCrKw9JfC2bFm099vJ7G1qYohMxXnOItd58m zKevVaW9qcCLFacVnyOlUnf907K34vGLHxE+GYl7Th5kNPh6YshKZ0rDXT7FW4lwdsfy KqWD2p2Sq9/+3G54xZ5+3jN6rmtaGF93VSRRfuIx4bGl7xQm8nZXJpHDc8BMma1vO7dT 55JVBn1zOytRpa1doTjDXOFX7Z+6TQGRmtJ94geWd1wvtEVbLclfGr8clGMYMg8tAGKl AgCRx3FCuPJ6/8chgedZnj3HVr2cmzAOTU2gU8BgyjL3ju48HYQDlEyF+/+HuwquaH7o KXTA== MIME-Version: 1.0 X-Received: by 10.58.133.66 with SMTP id pa2mr4606463veb.18.1380261712792; Thu, 26 Sep 2013 23:01:52 -0700 (PDT) In-Reply-To: References: <5242f8bc$0$30000$c3e8da3$5496439d@news.astraweb.com> <52437bca$0$30000$c3e8da3$5496439d@news.astraweb.com> Date: Fri, 27 Sep 2013 16:01:52 +1000 Subject: Re: Referrer key missing form os.environ dictionary? From: Chris Angelico To: python-list@python.org Content-Type: text/plain; charset=ISO-8859-1 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 19 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1380261715 news.xs4all.nl 15973 [2001:888:2000:d::a6]:46698 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:54864 On Fri, Sep 27, 2013 at 9:27 AM, Grant Edwards wrote: > I probably should have said "stdin", but in theory you can pass data > in via multiple file descriptors. Nobody does that except people > cooking up obscure examples for advanced shell scripting guides... Yep. With that variant, I agree that it's more common than env vars (apart from standard ones - *heaps* of programs are affected by stuff like LANG or HOME or PATH, but they're not passed at the command line); what your description put me in mind of, though, was the special handling sometimes done between two programs, like when the Unix program loader finds a #! and exec's an interpreter to process the script - for security, it has to pass the fd, not the file name, to the interpreter. But that's really esoteric! Of course, whenever you fork without execing (execking?), you can pass (or share) file descriptors easily. Very common, but not exactly command-line stuff. ChrisA