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could be a PATH issue try fully pathing your script:

proc = subprocess.Popen(['/usr/bin/bash /home/arod291/scripts/PDFGenerator.sh '+str(args)], stdout=subprocess.PIPE, shell = True)Check your...

$@ is a special variable meaning "all arguments".

Piping java's output through tail -1 gets you the last line and only the last line.

As the others said we may need the full script to determine what you are trying to do. I believe the posted line runs java PDFGenerator and captures the last line of output in the variable args.
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