Groups > comp.graphics.apps.gnuplot > #4551

Re: command from inside gnuplot

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From	Hans-Bernhard Bröker <HBBroeker@gmail.com>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Re: command from inside gnuplot
Date	Tue, 7 Nov 2023 18:52:17 +0100
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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.

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Thread

command from inside gnuplot Jörg Buchholz <bookwood4new@freenet.de> - 2023-11-07 10:24 +0100
  Re: command from inside gnuplot Chris Elvidge <chris@mshome.net> - 2023-11-07 10:16 +0000
  Re: command from inside gnuplot Hans-Bernhard Bröker <HBBroeker@gmail.com> - 2023-11-07 18:52 +0100
    Re: command from inside gnuplot Jörg Buchholz <bookwood4new@freenet.de> - 2023-11-08 07:27 +0100

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