$ for name in create-tap update-tap ; do ln -s 882180.pl $name ; done

$ ./create-tap
bar=
baz=13
foo=boo

$ ./create-tap --foo=FOO
bar=
baz=13
foo=FOO

$ ./update-tap
bar=bar
baz=42
foo=

$ ./update-tap --baz=55
bar=bar
baz=55
foo=