Change Environment Variable for Shell Command - MATLAB & Simulink (original) (raw)
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This example shows how to substitute a user-specified value for an environment variable value set by MATLAB® when you call a function using the system command.
When you use the system command to call a function, the function inherits the MATLAB environment. To change environment variable values, use a shell wrapper. Use the environment variable MATLAB_SHELL to specify a shell containing your updated variable. This example uses a custom value for the environment variable LD_LIBRARY_PATH.
Create a wrapper file matlab_shell.sh in the folder_<PATHTOSHELLSCRIPT>_ with the following contents, where <MYLIBRARYPATH> is your custom value.
#!/bin/sh
LD_LIBRARY_PATH= export LD_LIBRARY_PATH
exec SHELL:−/bin/sh{SHELL:-/bin/sh} SHELL:−/bin/sh*
If you have a user-defined value for SHELL, the expression${SHELL:-/bin/sh} uses your SHELL value. Otherwise, MATLAB uses the Bourne shell.
From the operating system prompt, call MATLAB setting MATLAB_SHELL to:
/matlab_shell.sh
Display your value of LD_LIBRARY_PATH from the MATLAB command prompt.
Now when you call a function using the system command, the function uses the LD_LIBRARY_PATH value specified by_<MYLIBRARYPATH>_.