Applying Matlab variables in a UNIX command

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Kevin
Kevin 2016-1-18
评论： Kevin 2016-1-21
I am building a MATLAB script to generate many input files with unique file names, then to feed these files to a program that can only be run from the command line (UNIX, I'm on a Mac). One of my final barriers is to be able to use MATLAB variables in the UNIX command line. This is a very basic example, but for instance if I execute the following code:
folderName = test;
unix('cd /path; mkdir folderName')
the folder is created with the name "folderName" rather than test, whereas I was hoping for the path /path/test to be created. Any ideas?
Thank you very much!

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回答（2 个）

Thorsten
Thorsten 2016-1-18
编辑：Thorsten 2016-1-18
You can create the folder in Matlab as follows:
path = '/User/foobar/Matlab/xxx';
folder = 'test';
mkdir(fullfile(path, folder))
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Kevin
Kevin 2016-1-18
编辑：Kevin 2016-1-18
Thank you for your reply. It's clear to me that I did a poor job in asking this question, but it's important that I run in the UNIX environment.
I have a program that only runs from the command line, and I'm giving it input variables in the filename used in the command that are variables in the Matlab script. If I use UNIX, the command would look like
Program filename_var1_var2.txt
Etc, etc. Any ideas? Thank you.
Thorsten
Thorsten 2016-1-19
编辑：Thorsten 2016-1-19
You have to write the text file filename_var1_var2.txt from Matlab, and then call your program from the command line or from Matlab using system. What's the format of filename_var1_var2.txt? Do you have problems generating this file from Matlab? Have a look at Walter's answer that shows the principle way of how to do it.

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Walter Roberson
Walter Roberson 2016-1-18
folderName = 'test';
unix( sprintf('cd /path; mkdir ''%s''', folderName) )
If you want to live dangerously:
folderName = 'test';
unix( ['cd /path; mkdir ', folderName] )
which would lead you to endless fun if the folderName contained any shell special characters.
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Walter Roberson
Walter Roberson 2016-1-21
编辑：Walter Roberson 2016-1-21
Your PATH does not include your current directory. You could add that to the PATH, or you could change your command to
cmd = 'cd /Users/kevin/Desktop/Sims/PulseSims;./simpson simpsonInput';
Something in your program must have reset your PATH, or else you have started MATLAB in an odd way. For me on OS-X, starting by clicking the icon in the dock, I get
/Applications/MATLAB_R2014a.app/sys/java/jre/maci64/jre/bin:/Library/Frameworks/Maple.framework/Versions/2016/bin.APPLE_UNIVERSAL_OSX:/Library/Frameworks/Maple.framework/Versions/2016/jre.APPLE_UNIVERSAL_OSX/bin/:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/MATLAB_R2014a.app/bin:/Applications/MATLAB_R2014a.app/bin/maci:/Applications/MATLAB_R2014a.app/sys/os/maci:/Applications/MATLAB_R2014a.app/bin/maci64:/Applications/MATLAB_R2014a.app/sys/os/maci64
If you are starting MATLAB from the command line on a Linux system then you would be invoking a shell script named "matlab" which should set the PATH and then invoke the MATLAB executable. It is not impossible that someone has mangled that script.
The only other reason I can think of that your PATH might be like that is if someone has changed the actual MATLAB executable to be suid or sguid : in such a case in order to prevent security problems, the operating system would automatically change to a restricted PATH very similar to the one you are seeing, ignoring any environment variables.
Kevin
Kevin 2016-1-21
Walter,
Thank you again for your reply. I tried your suggestions, and while they did not work exactly, your comment got me thinking. In the end I only had to add a bit to PATH:
PATH=$PATH:/bin:/usr/local/bin
and it was able to find the command simpson. Thanks so much for your help and inspiration!

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