Problems with system() call.

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Clark
Clark 2014-9-4
回答： Clark 2014-9-12
This is breaking our production runs, thanks for the help.
We have R2013b executing on Ubuntu 14.04:
Linux kashmir 3.13.0-32-generic #57~precise1-Ubuntu SMP Tue Jul 15 03:51:20 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Our job chokes on the empty 'user' variable:
>> [status, user] = system( 'echo -n $DB_FULL_USER' )
status =
0
user =
''
Ooops, next time we make the call we get an erroneous doublet:
>> [status, user] = system( 'echo -n $DB_FULL_USER' )
status =
0
user =
matlabmatlab
Then on the next call we go back to normal for a 'while':
>> [status, user] = system( 'echo -n $DB_FULL_USER' )
status =
0
user =
matlab
The painful thing is that this is years old code, never broke before. AFAIK it's intermittent. Very strange, and I don't know what to do about it other than to loop on system(), but that seems crazy. Anybody have any idea what's happening?
THANK YOU
Clark

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回答（1 个）

Clark
Clark 2014-9-12
This post appears to be related:
http://stackoverflow.com/questions/21120296/matlab-getenv-unable-to-find-some-linux-environment-variables.
Here we find that:
map = java.lang.System.getenv();
seems to be the means used by getenv() to attain its results.
whereas:
[ status, blahVal ] = system( 'echo -n $BLAH' )
could not "possibly" be using java. We're going to try switching our usage to getenv(). A few more days and we'll know if it's any better.

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