Aug 10 (Reuters) - Canada’s main stock index inched up on Tuesday as commodity-linked sectors recovered from steep losses, although investors remained on edge due to rising COVID-19 cases across the globe. * At 9:30 a.m. ET (13:30 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 26.6 points, or 0.13%, at 20,464.02. Reporting by Ambar Warrick; editing by Vinay Dwivedi Our Standards: The Thomson Reuters Trust Principles.