$ if [ ! -z `find "WS1617/Übungsblätter" -type f -name "*
.pdf" -print -quit` ]; then
>     echo "pdf file found!"
> fi
bash: [: WS1617/Übungsblätter/Blatt: binary operator expected
$ if [ ! -z `find "Tut Repo.gitty" -type f -name "*.pdf"
-print -quit` ]; then
>     echo "pdf file found!"
> fi
bash: [: Tut: binary operator expected
$ if [ ! -z `find "WS1617/Vorlesungsfolien" -type f -name
 "*.pdf" -print -quit` ]; then
>     echo "pdf file found!"
> fi
pdf file found!