in reply to How can a perl script call a parallelized program using its system function?

I tried in vain to include the line system("module load impi"); just before initiating the call to VASP. I

Loading the modules in a separate call to system won't help because they will not be visible to the second system call.

Instead, doing both commands in the same system call ought to work:

system( "module load impi && PATH_to_executable > vasp.out" );

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