Suppressing command output

Question

John F 2011-8-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/13897-suppressing-command-output

回答： Helder Magalhães 2022-1-12

I am using the function "system(<SOME COMMAND>)" in a function. The command I'm calling has a lot of screen outputs that I'd like to suppress. How can I do that?

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

Fangjun Jiang 2011-8-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/13897-suppressing-command-output#answer_19003

在 MATLAB Online 中打开

try below. It just saves the screen outputs.

system('dir >output.txt')

4 个评论
显示 2更早的评论隐藏 2更早的评论

Fangjun Jiang 2011-8-17

Thanks, Jason! Nice to know. Is this 1 and 2 refer to MATLAB fid 1 and 2?

Jason Ross 2011-8-17

I've always thought of it as stdout (1) and stderr (2). I've used this extensively outside of MATLAB for other scripting duties. There's a nice summary of redirection commmands at

http://www.robvanderwoude.com/redirection.php

请先登录，再进行评论。

Answer 2

Helder Magalhães 2022-1-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/13897-suppressing-command-output#answer_873265

在 MATLAB Online 中打开

It's also possible to use "system" (console) based filtering to avoid the whole output to be redirected to Matlab. For example, taking a directory listing in Windows environment:

% the first part only lists text files, including details
% the part after the pipe filters relevant lines
% (to only dump filenames, use 'dir /b' instead)
sys_cmd = 'dir "C:\MyDirectory\*.txt" | find ".txt"';
system(sys_cmd, '-echo');

I wouldn't generally recommend using system calls often, as it may easily break the possibility of porting your software/environment to another platform. But for quick experiments/diagnostics it can become very handy, specially if one is familiar with command-line environment.