4 ms·
The "-" is here to not error when the variable does not exist (as the topmost set is configured to trigger error on unset variables). It is meant to substitute
by vbernat 6y ago
The "-" is here to not error when the variable does not exist (as the topmost set is configured to trigger error on unset variables). It is meant to substitute the (empty) string on the right if the left variable does not exist.