12.6.2 ACTION Specifier

The ACTION specifier indicates the allowed I/O operations for the file connection. It takes the following form:

ACTION = act

act
Is a scalar default character expression that evaluates to one of the following values:

'READ'	Indicates that only READ statements can refer to this connection.
'WRITE'	Indicates that only WRITE, DELETE, and ENDFILE statements can refer to this connection.
'READWRITE'	Indicates that READ, WRITE, DELETE, and ENDFILE statements can refer to this connection.

The default is 'READWRITE'.