How to run an .exe file by one command?

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Ivan Mich
Ivan Mich on 6 May 2020
Commented: Walter Roberson on 15 May 2020
Hello,
I have a question about a code. I would like to ask a question. I would like to run an .exe file via matlab. My .exe first of all requires an input file in order to run. For this purpose I use the command:
status = system('file.exe input.txt')
Secondly, after putting this command, the .exe file requires to type a specific number in order to run. I would like to avoid typing by hand this number and taking it from an another .txt file .
Could anyone help me?
  2 Comments
Rik
Rik on 6 May 2020
If you don't want to type it manually, you need to make sure you can enter it through the command line itself. Note that using a batch file to do this is also an option, if you can't get everything on a single line of code.
Mario Malic
Mario Malic on 6 May 2020
Could you refer to the .exe program you are calling if there's an option to add it as a parameter?
Example:
status = system('file.exe input.txt' -p 1)

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Answers (1)

Ameer Hamza
Ameer Hamza on 6 May 2020
You can use input redirection to type the input from a txt file. Something like this
status = system('file.exe input.txt < number.txt')
  25 Comments
Ameer Hamza
Ameer Hamza on 15 May 2020
You can get away with few lines in Walter's code if you know that there will be no issue with reading and writing to a file.
if fidin < 0; error('failed to open "%s" for reading', datafile); end
and other such lines. Apart from that, any further attempt to make code compact will usually make the logic more complicated.
Walter Roberson
Walter Roberson on 15 May 2020
The above is the simplest way to do what you ask: it uses only basic I/O operations. But simplest is not the same as shortest.
datafile = 'data.txt'; %read from it
inputfile = 'input_2.txt'; %read from it
newinputfile = 'input.txt'; %write to it
lines = regexp(fileread(inputfile), '\r?\n','split');
number5 = textscan(fileread(datafile),'%*s%*s%*s%*s%s', 1, 'headerlines', 1);
lines(7) = number5{1};
fid = fopen(newinputfile,'wt'); fprintf(fid, '%s\n', lines{:}); fclose(fid);
status = sytem( sprintf('file.exe < "%s"', newinputfile) );
To understand this you have to understand something about the text processing utility regexp(), and several of the less-common details about textscan(), and understand how cell expansion interacts with fprintf()

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