FOPTNUM Function: UNIX

Returns the number of information items that are available for an external file.

Category:	External Files
UNIX specifics:	Information items available
See:	FOPTNUM Function in SAS Functions and CALL Routines: Reference

Syntax

Details

Syntax

FOPTNUM(file-id)

Required Argument

file-id: specifies the identifier that was assigned when the file was opened, generally by the FOPEN function.

Details

Under UNIX, five information items are available for all types of files:

Filename
Owner Name
Group Name
Access Permission
File Size (bytes)

If you concatenate filenames, then an additional information item is available: File List. If you are using pipe files, then the only information item available is PIPE Command.

The open-mode specified in the FOPEN function determines the value that FOPTNUM returns.

Open Mode and FOPTNUM Values

Open Mode	FOPTNUM Value	Information Items Available
Append Input Update	6 for concatenated files 5 for single files	All information items available.
Output	5 for concatenated files 4 for single files	Because the file is open for output, the File Size information type is unavailable.
Sequential (using Pipe Device Type)	1	The only information item available is PIPE Command.

For an example of how to use the FOPTNUM function, see File Attributes When Using the Pipe Device Type.

FOPTNUM Function: UNIX

Syntax

Required Argument

Details

See Also