System calls in matlab with Xgrid produced error -- The unix() and ! commands are disabled.

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Hui Zheng 2011-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/21332-system-calls-in-matlab-with-xgrid-produced-error-the-unix-and-commands-are-disabled

评论： Scott 2014-8-7

We are using Matlab on our Xgrid system. The job script looks like this:

mc=rand(4)
figure; hold on;
plot(mc(:, 1), 'r');
plot(mc(:, 2), 'g');
plot(mc(:, 3), 'b');
legend('x', 'y', 'z', 'Location', 'Best');
set(gca, 'FontSize', 14);
title('MCFLIRT estimated rotations (radians)');
%print -djpeg99 mc_rot
print(gcf, 'mc_rot.jpeg', '-djpeg');
%%%%%%%%%%%%%%%%%%%%%%
system('pwd');
exit

The first part of the script (until print) worked fine. But when it reached the system command, it hang. After force stop the stop, I can see the error message is "??? Error using ==> system The unix() and ! commands are disabled."

I did "ls -l /dev" during two separated calls of the script using Xgrid (one with the system call, one without), I saw an extra line for the job with system call being " crw--w---- 1 root tty 16, 5 Nov 16 11:26 ttys005". And if I ran the system call without Xgrid, it worked. I didn't get the extra line as well. I guess the problem is the ttys005's ower is root rather than the user who called the job?

I am using Matlab2010b and Mac 10.6.8.

Thanks, Zheng Hui

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Nikolai 2013-5-21

I have also recently encountered this same error message. Have you figured out how to resolve this issue?

Scott 2014-8-7

For what its worth, I experienced this same error message a couple of times when I started matlab before all system disks were NFS mounted. Restarting matlab once the disks were mounted resolved the issue.

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