Suppressing command output
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John F
le 17 Août 2011
Réponse apportée : Helder Magalhães
le 12 Jan 2022
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?
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Fangjun Jiang
le 17 Août 2011
try below. It just saves the screen outputs.
system('dir >output.txt')
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Fangjun Jiang
le 17 Août 2011
Thanks, Jason! Nice to know. Is this 1 and 2 refer to MATLAB fid 1 and 2?
Jason Ross
le 17 Août 2011
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
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Helder Magalhães
le 12 Jan 2022
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.
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