Re: [Gnuplot-info] howto change shell on Linux

[Ethan A M. <EAM...@gm...>]

On Saturday, 17 December 2016 01:48:53 PM ivana richterova wrote:
> Hi all,
> 
> I'd like to change shell used for system calls on linux. I quess it
> should work the same way as Unix according to manual (set SHELL
> env_var) but it doesn't.

Gnuplot uses the system() call, which always uses /bin/sh
See man (3) system:

SYNOPSIS
       #include <stdlib.h>

       int system(const char *command);

DESCRIPTION
       The  system()  library  function uses fork(2) to create a child process that exe‐
       cutes the shell command specified in command using execl(3) as follows:

           execl("/bin/sh", "sh", "-c", command, (char *) 0);


So no, it is not possible to change the shell used for a system call.


> 
> On
> #Linux deimos 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-3 (2015-04-23)
> x86_64 GNU/Linux
> #GNU bash, version 4.3.33(1)-release (x86_64-pc-linux-gnu)
> 
> I get:
> #> export SHELL=/bin/bash; gnuplot -d -e 'pr system("echo $0 $SHELL")'
> # sh /bin/bash
> 
> Does anybody know how to change shell used by gnuplot on linux?
> 
> thanks
> 
> Iva
> 
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