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| References | (2 earlier) <54974ed7$0$12986$c3e8da3$5496439d@news.astraweb.com> <0udf9a1m3n02rt06a5ib58mvifm7sdeg31@4ax.com> <roy-EA8A15.08132522122014@news.panix.com> <54983747$0$12994$c3e8da3$5496439d@news.astraweb.com> <qot4msnk87t.fsf@ruuvi.it.helsinki.fi> |
|---|---|
| Date | 2014-12-22 17:03 +0100 |
| Subject | Re: Hello World |
| From | Chris Warrick <kwpolska@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.17123.1419264242.18130.python-list@python.org> (permalink) |
On Mon, Dec 22, 2014 at 4:36 PM, Jussi Piitulainen
<jpiitula@ling.helsinki.fi> wrote:
> Steven D'Aprano writes:
>
>> Don't try this at home!
>>
>> # download_naked_pictures_of_jennifer_lawrence.py
>> import os
>> os.system("rm ――rf /")
>
> Not sure what that character is (those characters are) but it's not
> (they aren't) the hyphen that rm expects in its options, so:
>
> >>> os.system("rm ――rf /")
> rm: cannot remove `――rf': No such file or directory
> rm: cannot remove `/': Is a directory
> 256
Let‘s ask Python: (polyglot 2.6+/3.3+ code!)
from __future__ import print_function
import unicodedata
command = u"rm ――rf /"
for i in command:
print(hex(ord(i)), unicodedata.name(i))
0x72 LATIN SMALL LETTER R
0x6d LATIN SMALL LETTER M
0x20 SPACE
0x2015 HORIZONTAL BAR
0x2015 HORIZONTAL BAR
0x72 LATIN SMALL LETTER R
0x66 LATIN SMALL LETTER F
0x20 SPACE
0x2f SOLIDUS
There’s your answer: it’s U+2015 HORIZONTAL BAR, twice. And `rm`
wants U+002D HYPHEN-MINUS instead.
Moreover, it wants only one HYPHEN-MINUS and not two:
Linux:
$ rm --rf /
rm: unrecognized option '--rf'
Try 'rm --help' for more information.
BSD:
$ rm --rf /
rm: illegal option -- -
usage: rm [-f | -i] [-dIPRrvWx] file ...
unlink file
That’s two-step “protection”.
(This e-mail brought to you by Unicode.)
--
Chris Warrick <https://chriswarrick.com/>
PGP: 5EAAEA16
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Hello World Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-20 23:57 +1100
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-21 00:11 +1100
Re: Hello World Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-12-20 16:13 +0000
Re: Hello World Rustom Mody <rustompmody@gmail.com> - 2014-12-20 08:50 -0800
Re: Hello World Steve Hayes <hayesstw@telkomsa.net> - 2014-12-20 20:39 +0200
Re: Hello World alister <alister.nospam.ware@ntlworld.com> - 2014-12-20 22:18 +0000
Re: Hello World CM <cmpython@gmail.com> - 2014-12-20 21:14 -0800
Re: Hello World Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-21 16:26 +1100
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-21 16:31 +1100
Re: Hello World Terry Reedy <tjreedy@udel.edu> - 2014-12-21 01:31 -0500
Re: Hello World wxjmfauth@gmail.com - 2014-12-21 00:07 -0800
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-21 17:44 +1100
Re: Hello World CM <cmpython@gmail.com> - 2014-12-20 23:44 -0800
Re: Hello World CM <cmpython@gmail.com> - 2014-12-20 23:45 -0800
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2014-12-21 10:26 +0200
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-21 18:46 +1100
Re: Hello World albert@spenarnc.xs4all.nl (Albert van der Horst) - 2015-01-08 12:43 +0000
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-08 23:53 +1100
Re: Hello World albert@spenarnc.xs4all.nl (Albert van der Horst) - 2015-01-08 13:37 +0000
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2015-01-08 16:06 +0200
Re: Hello World alister <alister.nospam.ware@ntlworld.com> - 2015-01-08 14:21 +0000
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2015-01-08 16:31 +0200
Re: Hello World alister <alister.nospam.ware@ntlworld.com> - 2015-01-08 15:14 +0000
Re: Hello World Michael Ströder <michael@stroeder.com> - 2015-01-08 15:11 +0100
Re: Hello World albert@spenarnc.xs4all.nl (Albert van der Horst) - 2015-01-17 14:51 +0000
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-18 01:57 +1100
Re: Hello World cl@isbd.net - 2015-01-17 15:18 +0000
Re: Hello World Michael Torrie <torriem@gmail.com> - 2015-01-17 09:29 -0700
Re: Hello World cl@isbd.net - 2015-01-17 16:47 +0000
Re: Hello World albert@spenarnc.xs4all.nl (Albert van der Horst) - 2015-01-17 18:06 +0000
Re: Hello World Michael Ströder <michael@stroeder.com> - 2015-01-17 19:47 +0100
Re: Hello World Michael Torrie <torriem@gmail.com> - 2015-01-17 19:09 -0700
Re: Hello World Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-18 13:37 +1100
Re: Hello World Roy Smith <roy@panix.com> - 2015-01-17 22:18 -0500
Re: Hello World Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-18 14:45 +1100
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-18 18:45 +1100
Re: Hello World Roy Smith <roy@panix.com> - 2015-01-18 07:26 -0500
Re: Hello World Tim Chase <python.list@tim.thechases.com> - 2015-01-17 21:50 -0600
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-18 18:44 +1100
Re: Hello World Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-17 18:31 +0000
Re: Hello World Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-18 10:46 +1100
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-18 11:04 +1100
Re: Hello World Jason Friedman <jsf80238@gmail.com> - 2015-01-17 18:19 -0700
Re: Hello World Michael Torrie <torriem@gmail.com> - 2015-01-17 19:13 -0700
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2015-01-18 12:03 +0200
Re: Hello World Michael Ströder <michael@stroeder.com> - 2015-01-18 14:34 +0100
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2015-01-18 18:03 +0200
Re: Hello World Michael Ströder <michael@stroeder.com> - 2015-01-18 19:39 +0100
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-18 21:10 +1100
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2015-01-18 22:50 +0200
Re: Hello World Michael Ströder <michael@stroeder.com> - 2015-01-18 14:32 +0100
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-18 21:00 +1100
Re: Hello World Michael Ströder <michael@stroeder.com> - 2015-01-18 14:35 +0100
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-19 00:57 +1100
Re: Hello World Michael Ströder <michael@stroeder.com> - 2015-01-18 16:48 +0100
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-19 04:08 +1100
Re: Hello World Michael Ströder <michael@stroeder.com> - 2015-01-18 14:30 +0100
Re: Hello World Steve Hayes <hayesstw@telkomsa.net> - 2015-01-08 19:02 +0200
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2015-01-09 04:11 +1100
Re: Hello World albert@spenarnc.xs4all.nl (Albert van der Horst) - 2015-01-17 15:10 +0000
Re: Hello World Michael Torrie <torriem@gmail.com> - 2015-01-08 10:53 -0700
Re: Hello World Grant Edwards <invalid@invalid.invalid> - 2015-01-08 18:57 +0000
Re: Hello World Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-01-17 16:06 -0800
Re: Hello World Tony the Tiger <tony@tiger.invalid> - 2014-12-21 19:22 +0000
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2014-12-21 22:02 +0200
Re: Hello World Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-22 09:51 +1100
Re: Hello World Roy Smith <roy@panix.com> - 2014-12-21 18:50 -0500
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-22 11:10 +1100
Re: Hello World Roy Smith <roy@panix.com> - 2014-12-21 19:12 -0500
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-22 11:36 +1100
Re: Hello World mm0fmf <none@mailinator.com> - 2014-12-22 00:20 +0000
Re: Hello World Tim Chase <python.list@tim.thechases.com> - 2014-12-21 18:47 -0600
Re: Hello World Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-12-22 02:56 +0000
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2014-12-22 10:52 +0200
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-22 20:01 +1100
Re: Hello World Grant Edwards <invalid@invalid.invalid> - 2014-12-22 16:23 +0000
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-23 04:25 +1100
Re: Hello World Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-12-22 18:51 +0000
Re: Hello World MRAB <python@mrabarnett.plus.com> - 2014-12-22 19:05 +0000
Re: Hello World Tim Chase <python.list@tim.thechases.com> - 2014-12-22 13:16 -0600
Re: Hello World Roy Smith <roy@panix.com> - 2014-12-22 19:55 -0500
Re: Hello World sohcahtoa82@gmail.com - 2014-12-22 17:03 -0800
Re: Hello World MRAB <python@mrabarnett.plus.com> - 2014-12-23 01:37 +0000
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-23 12:39 +1100
Re: Hello World Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-12-23 02:36 +0000
Re: Hello World Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-12-23 12:24 -0500
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-23 12:03 +1100
Encryption - was Hello World Dave Angel <d@davea.name> - 2014-12-22 14:57 -0500
Re: Encryption - was Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-23 09:29 +1100
Re: Encryption - was Hello World Dave Angel <davea@davea.name> - 2014-12-22 18:22 -0500
Re: Hello World Rustom Mody <rustompmody@gmail.com> - 2014-12-21 18:37 -0800
Re: Hello World Steve Hayes <hayesstw@telkomsa.net> - 2014-12-22 08:21 +0200
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-22 17:33 +1100
Re: Hello World Steve Hayes <hayesstw@telkomsa.net> - 2014-12-22 09:46 +0200
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-22 18:56 +1100
Re: Hello World Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-22 20:18 +1100
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2014-12-22 11:34 +0200
Re: Hello World Rustom Mody <rustompmody@gmail.com> - 2014-12-22 19:38 -0800
Re: Hello World Roy Smith <roy@panix.com> - 2014-12-22 08:15 -0500
Re: Hello World Chris Angelico <rosuav@gmail.com> - 2014-12-23 00:23 +1100
OFF TOPIC Snow Crash [was Re: Hello World] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-23 13:09 +1100
Re: OFF TOPIC Snow Crash [was Re: Hello World] Grant Edwards <invalid@invalid.invalid> - 2014-12-23 16:20 +0000
Re: OFF TOPIC Snow Crash [was Re: Hello World] Rustom Mody <rustompmody@gmail.com> - 2014-12-23 08:41 -0800
Re: OFF TOPIC Snow Crash [was Re: Hello World] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-24 12:51 +1100
Re: OFF TOPIC Snow Crash [was Re: Hello World] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-24 14:18 +1100
Re: OFF TOPIC Snow Crash [was Re: Hello World] alister <alister.nospam.ware@ntlworld.com> - 2014-12-24 11:50 +0000
Re: OFF TOPIC Snow Crash [was Re: Hello World] alex23 <wuwei23@gmail.com> - 2014-12-26 09:34 +1000
Re: OFF TOPIC Snow Crash [was Re: Hello World] alex23 <wuwei23@gmail.com> - 2014-12-26 09:27 +1000
Re: OFF TOPIC Snow Crash [was Re: Hello World] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-26 15:13 +1100
Re: OFF TOPIC Snow Crash [was Re: Hello World] alister <alister.nospam.ware@ntlworld.com> - 2014-12-26 10:03 +0000
Re: Hello World Marko Rauhamaa <marko@pacujo.net> - 2014-12-22 15:26 +0200
Re: Hello World Roy Smith <roy@panix.com> - 2014-12-22 08:41 -0500
Re: Hello World Roy Smith <roy@panix.com> - 2014-12-22 08:13 -0500
Re: Hello World Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-23 02:22 +1100
Re: Hello World Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2014-12-22 17:36 +0200
Re: Hello World Chris Warrick <kwpolska@gmail.com> - 2014-12-22 17:03 +0100
Re: Hello World Skip Montanaro <skip.montanaro@gmail.com> - 2014-12-22 09:39 -0600
Re: Hello World Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-23 03:54 +1100
Re: Hello World Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-12-22 18:48 +0000
Re: Hello World Grant Edwards <invalid@invalid.invalid> - 2014-12-22 16:26 +0000
Re: Hello World Grant Edwards <invalid@invalid.invalid> - 2014-12-22 16:18 +0000
Re: Hello World alister <alister.nospam.ware@ntlworld.com> - 2014-12-22 19:05 +0000
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