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From: =?UTF-8?Q?J=C3=B6rg_Buchholz?= <bookwood4new@freenet.de>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: command from inside gnuplot
Date: Wed, 8 Nov 2023 07:27:16 +0100
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Xref: csiph.com comp.graphics.apps.gnuplot:4552

On 07.11.23 18:52, Hans-Bernhard Bröker wrote:
> Am 07.11.2023 um 10:24 schrieb Jörg Buchholz:
>> Hi,
>>
>> i have a problem to use a system command from inside gnuplot.
>>
>> sed -i 's/^\xef\xbb\xbf//' ./process-2023-11-02-13-04-40.csv
>>
>> works at the terminal
>>
>>
>> system "sed -i 's/^\xef\xbb\xbf//' ./process-2023-11-02-13-04-40.csv"
>> and
>> system(sprintf("sed -i 's/^\xef\xbb\xbf//' 
>> ./process-2023-11-02-13-04-40.csv"))
> 
> Unfortunately this suffers from a lack of escaping.  Please note that 
> "strings in double quotes" go through some pre-processing in gnuplot, 
> including backslash escape substitution done to them before being used. 
> So if you want literal backslashes, they have to be escaped. See "help 
> quote" for the details.
> 
> What that means is that
> 
> system "sed -i 's/^\\xef\\xbb\\xbf//' ./process-2023-11-02-13-04-40.csv"
> 
> should work better.
> 
That's it. Thanks a lot. I was nearby, but use the wrong slash to 
escaped backslashes.

Jörg