Bash feature in custom shell script not working

[Florian Zimmermann]

(Debian testing, digiKam 8.3.0, Batch Queue Manager -> User Shell Script)

I hope below is self-explanatory:

abc=${INPUT:3} # this is a bash feature to sub-string from offset 3, it 
works fine in a terminal echo $abc >>/tmp/f # NOK, it writes an empty 
string, why? echo $INPUT >>/tmp/f # OK echo $SHELL >>/tmp/f #OK for 
proving I'm really in a bash

What could I have missed? Thanks!
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