How can sqlFluff delete new line carriers from certain keywords while disregarding reserved keywords?

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You can use the --linters=select_columns_separate_lines command-line option to ignore new line carriers in SELECT statement columns while ignoring reserved keywords. For example:

--sqlfluff lint --linters=select_columns_separate_lines input_file.sql

This will tell sqlFluff to ignore new line carriers only in SELECT statement columns while preserving reserved keywords.