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Re: [PATCH] Convert open("-|") to qx{} calls

From
Randal L. Schwartz <merlyn@stonehenge.com>
Date
Feb 23, 2006, 20:41 UTC
Message-ID
<86lkw1g647.fsf@blue.stonehenge.com>
In-Reply-To
<Pine.LNX.4.63.0602232039160.30630@wbgn013.biozentrum.uni-wuerzburg.de>
>>>>> "Johannes" == Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:

Johannes> Now that our local Perl guru joined the discussion, may I ask what Johannes> is, and what is not quoted when put inside qx{}?

Nothing is quoted.  Your string acts as if it was XXX in:
        sh -c 'XXX'

so any quoting is entirely on your own. Thus, without the multi-arg exec in my proposed replacement, you can get shell-ish interactions that can ruin your day pretty bad.

Johannes> I had the Johannes> impression that all arguments are quoted, except that variables are Johannes> resolved first. Was that wrong? IOW does

Johannes> 	qx{bash $variable}
Johannes> quote the value of $variable, or not?

The Perl $variable is expanded to its current contents. But suppose the contents are `date` (including the backquotes). That would mean that a shell would execute a date command, and *its* output would then contribute further to the command invocation.

-- 
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn@stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
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Previous: Johannes SchindelinNext: Alex Riesen
Message 7 of 13 in “Convert open("-|") to qx{} calls”
  1. Convert open("-|") to qx{} callsJohannes Schindelin, Feb 23, 2006
  2. Alex RiesenFeb 23, 2006
  3. Randal L. SchwartzFeb 23, 2006
  4. Junio C HamanoFeb 23, 2006
  5. Randal L. SchwartzFeb 23, 2006
  6. Johannes SchindelinFeb 23, 2006
  7. Randal L. SchwartzFeb 23, 2006
  8. Alex RiesenFeb 23, 2006
  9. Randal L. SchwartzFeb 23, 2006
  10. Rogan DawesFeb 24, 2006
  11. Alex RiesenFeb 24, 2006
  12. Rogan DawesFeb 24, 2006
  13. Alex RiesenFeb 24, 2006

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