Can I manipulate .xls workbooks in linux (tcsh)

I have 2 Excel Workbooks, A and B. Workbook A.xls has 2 worksheets, Sheet1 and Sheet2. Workbook B.xls also has Sheet1 and Sheet2. Without opening the workbooks, I would like to delete Sheet2 in A.xls, and replace it with Sheet2 from B.xls. It is something that I need to do quite a lot, hence the need to cut out the opening of the workbooks!