## 7.1.1 Control List

The control list is composed of parameters that specify one or more of the following:

- The logical unit to act upon

- The internal file to act upon

- The format (explicit or list-directed) to use for data editing; if explicit, the format specification

- The NAMELIST group-name specification

- The number of a record to access in direct-access mode

- The name of a variable that contains the completion status of an I/O operation

- The label of the statement that receives control if an error or end-of-file condition occurs

- The key field and key of reference to access a keyed-access record (VMS only)

The statement type can always be determined by the contents of its control list. For example, the control list of a formatted I/O statement always contains a format specifier (FMT=f or f), while that of a list-directed I/O statement always contains an asterisk (*) in place of a format specifier.

The control list takes the following form:

    (p [,p] . . . )

p
  Is a specifier taking the following form:

      [keyword =] value

  [keyword =] value
    Is one of several possible keywords and values that are described in the following sections.

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