Commands are ways to change the view, in terms of adding special columns, extracting parts of columns, merging columns, parsing strings into smaller chunks of data, and so on.
Add Count. Adds a running count of rows processed.
Cast Lets you change the column type for a row.
Drop. Lets you remove a column from a view.
Extract. Lets you extract part of a column into another column.
Merge Columns. Lets you join the contents of two columns.
Rename. Lets you rename a column.
Rename List. Lets you rename a list of columns.
Replace Nulls. Lets you replace nulls with a different character.
Split. Lets you divide a column into two or more columns.
Use Null. Lets you change an empty cell to a null cell.