The File Output operator uses delimiters to concatenate existing fields and exports new fields to a file.

**Table 1** Operator parameters description
Parameter	Description	Type	Mandatory	Default Value
Output delimiter	Set a delimiter.	string	Yes	None
Line breaker	Line delimiter, which can be any string specified by users based on the actual situation. Any character string is supported. The OS line delimiter is used by default.	string	No	\n
Output fields	Information about output fields: position: Position of output fields. field name: Names of output fields. type: Field type. If type is set to DATE, TIME, or TIMESTAMP, you must specify a time format. If type is set to other values, the time format is invalid. The example time format is yyyyMMdd HH:mm:ss. length: Field value length. If the actual field value is excessively long, the value is cut based on the configured length. When type is set to CHAR, spaces are added to the field value for supplement if the actual field value length is less than the configured length. When type is set to VARCHAR, no space is added to the field value for supplement if the actual field value length is less than the configured length.	map	No	None

The field is exported to a file.

Use the CSV File Input operator to generate two fields A and B.

The following figure shows the source file.

aaa,product
bbb,Bigdata

Configure the File Output operator, set Output delimiter to a comma (,), and export A and B to a file, as shown in the following figure.

The following figure shows the result.

aaa,product
bbb,Bigdata