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lang-bash
OPTINDis good here, too. just saiyan.$@:params=("${@##*[!0-9]*}")-- Keep all positional arguments, but only use numbers - anything else will be converted to null string which conveniently evaluates to 0 in arithmetic evaluations (my use case - function parameter is a list of integers, unset or null should default to 0 but caller sets variable name when unset).