Changing the shell for system commands to mingw-w64

Question

Runpu 2022-10-3

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回答： Jeremy Hughes 2024-4-29

Hi community,

I've been trying to use 'system' commands in MATLAB to execute operating system command (from MRtrix3 to be specific). However, to do so I need to change the shell from default to mingw-w64 for my windows laptop, which I've been struggling to do. While I've tryied things like:

setenv MATLAB_SHELL C:\msys2\mingw64.exe

inside my script before calling system comamnds, it doesn't actually work.

I wonder what can I do about this / what i did wrong.

Many thanks in advance

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dpb 2022-10-3

Is that documented anywhere, Walter? And what makes them special?

Walter Roberson 2022-10-4

Bottom of the system() page discusses MATLAB_SHELL and SHELL environment variables in the Unix section.

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Answer 1

Shivam 2023-6-24

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Hi, you can override an environment variable in the system command by modifying the command string. In your case, you want to set the MATLAB_SHELL variable to the path of the MinGW-w64 shell before executing your command.

Here's an example of how you can modify your system command to set the MATLAB_SHELL variable:

myPath = 'C:\msys2\mingw64.exe';  % Path to the MinGW-w64 shell
dosCommand = 'pacman -Su'; % For example 
system(['set MATLAB_SHELL=' myPath ' && ' dosCommand])

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Jeremy Hughes 2024-4-29

MATLAB_SHELL only has an effect on unix platforms. Windows only supports CMD

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Answer 2

Jeremy Hughes 2024-4-29

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On Windows, the only way to do this is to launch the desired shell with the command as an argument.

I couldn't (quickly) find the argumnents for mingw64 how to do this, but for powershell this would look like:

dosCommand = "dir"; % Dos Command needs to be escaped correctly to pass quotes if needed. 
wrappedCommand = sprintf('powershell --command "%s"',dosCommand)
wrappedCommand = 'powershell --command "dir"'

system(wrappedCommand)