Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!newsfeed.xs4all.nl!newsfeed1a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!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 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; '16,': 0.03; 'discard': 0.07; 'error:': 0.07; 'problem?': 0.07; 'string': 0.09; 'skip:/ 10': 0.09; 'wrapper': 0.09; 'cc:addr:python-list': 0.11; 'python': 0.11; '"python': 0.16; 'arg': 0.16; 'args,': 0.16; 'argument.': 0.16; 'binary.': 0.16; 'either;': 0.16; 'exist.': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'invokes': 0.16; 'subject:python': 0.16; 'language': 0.16; 'wrote:': 0.18; 'passing': 0.19; 'command': 0.22; 'feb': 0.22; 'shell': 0.22; 'cc:addr:python.org': 0.22; 'cc:2**0': 0.24; 'script': 0.25; 'compiled': 0.26; 'pass': 0.26; 'header:In-Reply- To:1': 0.27; 'am,': 0.29; "doesn't": 0.30; 'message- id:@mail.gmail.com': 0.30; '(which': 0.31; "skip:' 10": 0.31; 'file': 0.32; 'run': 0.32; 'limitation': 0.33; 'skip:# 10': 0.33; 'subject:the': 0.34; 'could': 0.34; 'but': 0.35; 'received:google.com': 0.35; 'add': 0.35; 'skip:. 10': 0.39; 'though,': 0.39; 'called': 0.40; 'space': 0.40; 'how': 0.40; 'truly': 0.60; "you're": 0.61; 'such': 0.63; 'more': 0.64; 'safe': 0.72; 'overcome': 0.74; 'env': 0.84; 'to:none': 0.92 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:cc :content-type; bh=VWIzuZS2cuz9n0+A+Dq51lsrku9wF4KXadb/kBQ7xv4=; b=zKUN1MuTmb6GOfJwEQlf3yqRkQ2f1gqAbKXFTyGpFefKF+SUy/hGQSf7UHyZ8wL14a 7QpvI6FtDK+Q8WNAQizwunHp3wbQfj/q5Qe4Nocv7eXsYhcNLpw4Y8zziJBJiGRfRh/N SGVE81q0QzFp0gPYsYuPknC36GiYFKoOaB8uDpMZiI6d3qiSwHJtE9qW2ptuq0r7w1no 8nYCruwpxVPZn/y7lFrY7+DM9DpxS9UxkKeJ4Rxk1MkEpyFx8bw6+fxaDe+YKuwWJ4Kq XIlE+KTgWZtF05RX+MSXN5V/DNXFFPG/f9E/VzW215kG1Iv5XeJ/EJ1LJrWUPS8WR2yx hw/g== MIME-Version: 1.0 X-Received: by 10.66.118.71 with SMTP id kk7mr17257685pab.14.1392504636934; Sat, 15 Feb 2014 14:50:36 -0800 (PST) In-Reply-To: References: Date: Sun, 16 Feb 2014 09:50:36 +1100 Subject: Re: passing an option to the python interpreter From: Chris Angelico Cc: Python mailing list Content-Type: text/plain; charset=UTF-8 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: 27 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1392504640 news.xs4all.nl 2829 [2001:888:2000:d::a6]:45076 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:66491 On Sun, Feb 16, 2014 at 9:32 AM, Jabba Laci wrote: > #!/usr/bin/env python -u > > But if I want to run it from the command line ($ ./unbuffered.py), I > get this error: > > /usr/bin/env: python -u: No such file or directory > > env is looking for "python -u" but such a command doesn't exist. > > How to overcome this problem? I could write > > #!/usr/bin/python -u That's a fundamental limitation with the shebang syntax: you can pass exactly one argument. Passing more than one is platform-dependent - some Unixes will pass multiple args, some will pass the whole string as a single arg (which is what you're seeing here), and I think some will discard everything from the space onward. What you could do is add a wrapper called 'pythonu'.which invokes 'env python -u %*'. Be aware, though, that shebanging to a shell script isn't safe either; modern Linuxes support it, but to be truly cross-platform, you'd have to write pythonu in a compiled language and make a binary. ChrisA