Get list of worksheets on the command line

Today I need to get a list of worksheets from a very large spreadsheet (~100 worksheets, many thousands of cells on each) quickly from the command line. My ruby script tried to parse the entire workbook and exploded all my RAM. Then I discovered grep -0 which prints matching occurrences only (each on a separate line) which is very useful with regular expression patterns. The “sheet name” entries are in the “workbook.xml” zipped up in the Excel file.

$ unzip -c your-large-spreadsheet.xlsx xl/workbook.xml | grep -o sheet\ name=\"[^\"]*\" | cut -d = -f 2