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Groups > comp.lang.python > #81567

Re: Quotation Ugliness

From random832@fastmail.us
Subject Re: Quotation Ugliness
Date 2014-11-26 09:12 -0500
References <grifkb-kpo1.ln1@ozzie.tundraware.com> <mailman.16304.1416966896.18130.python-list@python.org> <54756D5F.4040806@tundraware.com>
Newsgroups comp.lang.python
Message-ID <mailman.16322.1417011148.18130.python-list@python.org> (permalink)

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On Wed, Nov 26, 2014, at 01:04, Tim Daneliuk wrote:
> In this case, I am not trying to write a fullblown language or recover
> from syntax errors.   Here's a usecase - I want to know whether I need
> to use a sudo password when the user passes a command on the command line
> of a program:
> 
> someprog.py uname && sudo cat /etc/sudoers
> 
> vs.
> 
> someprog.py uname && echo "sudo cat /etc/suoders"
> 
> 
> In the first instance, I need the sudo passoword, in the second I don't.

I think first you need to understand how the command line works. Much of
this parsing - including both && and quotes - is handled by the shell
before your program ever sees it.

Imagine someprog.py is this very simple program:
import sys
print("%r" % (sys.argv,))

$ someprog.py uname
['someprog.py', 'uname']
$ someprog.py uname && sudo cat /etc/sudoers
['someprog.py', 'uname']
Password: {sudo executed independent of your program}
$ someprog.py uname && echo "sudo cat /etc/sudoers"
['someprog.py', 'uname']
sudo cat /etc/sudoers {echo executed independent of your program}
$ someprog.py uname "&&" sudo cat /etc/sudoers
['someprog.py', 'uname', '&&', 'sudo', 'cat', '/etc/sudoers']
$ someprog.py uname "&&" echo "sudo cat /etc/sudoers"
['someprog.py', 'uname', '&&', 'echo', 'sudo cat /etc/sudoers']
$ someprog.py 'uname && echo "sudo cat /etc/sudoers"'
['someprog.py', 'uname && echo "sudo cat /etc/sudoers"']

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Thread

Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 18:18 -0600
  Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-25 18:40 -0600
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 19:18 -0600
      Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-26 12:32 +1100
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:00 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:00 -0600
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 19:18 -0600
  Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-26 11:44 +1100
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 19:20 -0600
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 19:20 -0600
      Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-25 19:44 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:01 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:01 -0600
  Re: Quotation Ugliness Ben Finney <ben+python@benfinney.id.au> - 2014-11-26 12:54 +1100
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:04 -0600
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:04 -0600
      Using a password with ‘sudo’ (was: Quotation Ugliness) Ben Finney <ben+python@benfinney.id.au> - 2014-11-26 18:02 +1100
      Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-26 18:10 +1100
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 08:59 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 08:59 -0600
      Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-26 06:56 -0600
        Re: Quotation Ugliness Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2014-11-26 15:45 +0200
          Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 01:37 +1100
          Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-26 08:26 -0600
          Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 02:07 +1100
          Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 02:09 +1100
            Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:36 -0600
            Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:36 -0600
              Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 02:48 +1100
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:55 -0600
                Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 11:00 -0500
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:02 -0600
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:02 -0600
                Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 03:13 +1100
                Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 11:16 -0500
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:54 -0600
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:54 -0600
                Re: Quotation Ugliness alister <alister.nospam.ware@ntlworld.com> - 2014-11-26 16:45 +0000
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:54 -0600
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:55 -0600
              Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 10:53 -0500
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 08:58 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 08:58 -0600
          Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 02:06 +1100
          Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-26 09:23 -0600
          Re: Quotation Ugliness Ben Finney <ben+python@benfinney.id.au> - 2014-11-27 07:24 +1100
      Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 09:12 -0500
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:02 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:02 -0600
          Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 10:16 -0500

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