Csum is a tool for manipulating CSV, TSV, PSV and other table formats for the command line. It can be used for converting between several formats; selecting and manipulating cells matching a selector; inserting or rearranging columns; sorting, reversing, or selecting unique rows; rotating rows so they become the columns of the table; and more. It was designed for environments where the use of a graphical spreadsheet to edit a CSV file was not possible or practical.
