[shell] #715938: support of script parameters (using standard '--' as arguments separator)
Arguments after bare "--" string will not be processed by the shell command
You can use it to pass extra arguments to your script and expect for
them in 'scriptargs' afterwards.
assert 'data/scripts/script2.py' == __file__
assert '__main__' == __name__
assert ['-v'] == scriptargs, scriptargs