Why doesn't getenv work on MAC OS X?

10 次查看（过去 30 天）
Brando Miranda
Brando Miranda 2017-12-11
回答： Greg 2017-12-12
I was trying to get environment variables that I know exist but it returns empty arrays...is that normal?
hello =
00 empty char array
res =
00 empty char array
>>
from running
hello = getenv('hello')
res = getenv('SYSTEMROOT')
----
These are the scripts I am exactly running:
#!/bin/bash
alias matlab='/Applications/MATLAB_R2017a.app/bin/matlab -nodesktop -nosplash'
hello=hellohello
echo $hello
matlab -nodesktop -nosplash -nojvm -r "test_sh"
which runs the following:
clear;
%SLURM_JOBID = getenv('SLURM_JOBID')
%SLURM_ARRAY_TASK_ID = getenv('SLURM_ARRAY_TASK_ID')
hello = getenv('hello')
res = getenv('SYSTEMROOT')
PATH = getenv('PATH')
  2 个评论
Jos (10584)
Jos (10584) 2017-12-11
How do you know they exist? Apparently Matlab cannot find them. I have no problem on my Mac.
Brando Miranda
Brando Miranda 2017-12-11
what I do is run a bash script then in the bash script itself I create and echo the env variable. So it exists for sure at least in the bash script. The I run the matlab script and they are nowhere to be found:
#!/bin/bash
alias matlab='/Applications/MATLAB_R2017a.app/bin/matlab -nodesktop -nosplash'
hello=hellohello
echo $hello
matlab -nodesktop -nosplash -nojvm -r "test_sh"
which runs:
clear;
%SLURM_JOBID = getenv('SLURM_JOBID')
%SLURM_ARRAY_TASK_ID = getenv('SLURM_ARRAY_TASK_ID')
hello = getenv('hello')
res = getenv('SYSTEMROOT')
PATH = getenv('PATH')

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回答（1 个）

Greg
Greg 2017-12-12
One article I read indicates you need to call
export hello
To actually set hello as an environment variable. Otherwise, hello only exists as a "shell variable." I'm definitely not a MAC wizard, so I have no clue if that's correct, just a quick Google search.

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