Passing itemlinks to slash commands

[myName]

I am wanting to pass an itemlink to a slash command such as

/fs add <Linen Cloth>

but when I use GetItemInfo() BugSack returns "Usage: GetItemInfo(ItemID|"name"|"itemLink")

Presently I am add

SLASH_SERVANT1 = "/fs"
SlashCmdList.SERVANT = function(func, arg1)
	local infoType, itemID, itemLink = GetItemInfo(arg1)
end

What am I doing wrong here?