/salvagebag X u60 q99 forceWould salvage anything your char is capable of in bag X, that's below 60 utility and below 99% quality - without showing any prompt.
You obviously can use it without any additional parameter.
A
/salvagebag 1 force would salvage anything in bag 1 without any prompt, regardless of quality and utility.
Use the
force parameter with care or you might be ending up salvaging an item you need.