How to pass a Matlab variable to shell environment?

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MatteP
MatteP 2018-1-15
评论： Walter Roberson 2023-6-19
Good morning,
I have the same problem apperntly aksed in this thread
https://it.mathworks.com/matlabcentral/answers/317586-how-to-pass-a-variable-to-a-unix-command-e-g-sed-inside-a-matlab-script?s_tid=gn_loc_drop
but not solved.
I need to pass a variable from matlab to UNIX shell. Let's say I want to print a variable defined within Matlab workspace using "echo" (let's skip for the moment why I would want to do it). This was my attempt
for i=1:9
! echo ${i}
end
but it does not work. How can I pass then a variable defined in Matlab to UNIX environment?
Thanks and best regards

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回答（1 个）

Shivam
Shivam 2023-6-18
You can use system command in matlab , here is one use case -
% Define variables
var1 = 'Hello';
var2 = 'world';
% Construct the command
command = ['echo ', var1, ' ', var2];
% Execute the command
system(command);
Output - Hello World
Learn More about system commands - Execute operating system command and return output - MATLAB system - MathWorks India
  1 个评论
Walter Roberson
Walter Roberson 2023-6-19
Ran in:
If the var* values contain shell meta characters, then this approach can end up a little different than the echo ${i} approach in shell. Best would be to add quotes, like
% Define variables
var1 = 'Hello';
var2 = 'world';
% Construct the command
command = "echo '" + var1 + "' '" + var2 + "'"
command = "echo 'Hello' 'world'"
% Execute the command
system(command);
Hello world

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