well, maybe I puzzled the paths ... you should verify these.
The shell statement as such works if the file bla.doc.pdf is resident in the folder I specified.
Instance checking: A bit tricky with board tools, but I think creating a flagfile at the start of script / deleting it at the end should do
(first line in script should be then soemthing like 'If exist( flagfile ) exit 1 endif' )
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