mysql export data with coloumn name

mysq-export.sql

SET @table_name = "user";
SET @schema_name = "test_db";
SET @output_name = CONCAT("/var/lib/mysql-files/",@table_name,".txt");

SET @cols = NULL;
select GROUP_CONCAT(CONCAT("'",COLUMN_NAME,"'")) INTO @cols
			from INFORMATION_SCHEMA.COLUMNS
			WHERE TABLE_NAME = @table_name AND TABLE_SCHEMA = @schema_name;

SET @sql = CONCAT(" SELECT * FROM (SELECT ", @cols, " UNION ALL SELECT * FROM ", @table_name, ") as r ",
				  " INTO OUTFILE '", @output_name,
				  "' FIELDS TERMINATED BY '\\t' ");

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;