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loose "-s or use ${HOME} instead of ~

After -prune there must be -o (or, otherwise) in order to continue with files or non-pruned directories. Then if not a directory and name ends with pdf and name does not have _nobackup then print....

What if you run ../tut0/load.sh without test? And, how about setting bash's xtrace option?

For debug purposes, you might want to pwd in each and every script, and also ls the relevant paths/scripts.

In your modified example, I don't see that you would execute load.sh anywhere. What effect would you like to see? Please provide a complete transscript, showing what you are doing.

Try:
if ./load.sh ; then
echo "0"
else
echo "1"
fi

--
See test: operands (http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html#tag_20_128_05)
string
True if the...

The bash shell script:
#!/bin/bash

return main
does not make any attempt to run the utility named main. And, as jim mcnamara already said, you don't use return to exit from a bash shell script....