Running external commands without going through a shell?

Question

Joël Schaerer 2020-12-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/675913-running-external-commands-without-going-through-a-shell

评论： Joël Schaerer 2020-12-21

The Matlab system() command allows the user to run external commands. To do this, it spawns a shell, and uses it to run the provided command. (see https://fr.mathworks.com/help/matlab/ref/system.html)

This behavior is great for interactive use. However, for production code, it can cause issues with special characters as the shell will have a tendancy to over-interpret the given commands. So, for example, a directory with parenthesis in its name can cause shell errors and prevent the command from executing properly.

In the Python world, the subprocess module has a way to run commands directly, without spawning a shell (the "shell" argument):

https://docs.python.org/3.9/library/subprocess.html#frequently-used-arguments

Does Matlab have an equivalent? I know people have proposed various regular expressions to escape strings, but that is just not robust enough.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jan 2020-12-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/675913-running-external-commands-without-going-through-a-shell#answer_577180

在 MATLAB Online 中打开

You can try a mex routine: https://www.mathworks.com/matlabcentral/fileexchange/341-spawn

Maybe this works for you:

runtime = java.lang.Runtime.getRuntime();
process = runtime.exec('program arg1 arg2');  % non-blocking
% Continue Matlab processing in parallel to spawned process ...
% ...or:
rc = process.waitFor();    % block Matlab until external program ends
rc = process.exitValue();  % fetch an ended process' return code

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Joël Schaerer 2020-12-21

Thanks! I didn't get a chance to try it yet, but will try to report back when I do.

请先登录，再进行评论。

Answer 2

Nitin Kapgate 2020-12-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/675913-running-external-commands-without-going-through-a-shell#answer_576695

在 MATLAB Online 中打开

You can execute operating system commands from the MATLAB command line using the ! operator as an alternative to the system function. The exclamation point character (!), sometimes called bang, is a shell escape. The ! character indicates that the rest of the input line is a command to the operating system.

Use ! to call utilities or other executable programs without quitting MATLAB.

For example, the following code opens the Microsoft Excel on a WINDOWS platform:

!excel.exe

After the external program completes or you quit the program, the operating system returns control to MATLAB.

To run the application in background mode or display the output in a separate window, add & to the end of the line.

For example, the following statement opens the Microsoft Excel program and returns control to the command prompt so that you can continue running MATLAB commands:

!excel.exe &