File I-O Functions and Statements

 Creating a new file or accessing an existing file or device
 -----------------------------------------------------------
 OPEN
 Opens a file or device for retrieving or storing records (I-O).

 Closing a file or device
 ------------------------
 CLOSE
 Ends I-O to a file or device.


 Storing data in a file
 ----------------------
 PRINT #
 Stores a list of variables as record fields in a previously opened file.1

 PRINT # USING
 Similar to PRINT #, except PRINT # USING formats the record fields.1

 WRITE #
 Stores a list of variables as record fields in a previously opened file.1

 WIDTH #
 Specifies a standard width for each record in a file.1

 PUT
 Stores the contents of a user-defined variable in a previously opened file.2


 Retrieving data from a file
 ---------------------------
 INPUT #
 Reads fields from a record and assigns each field in the record to a program
 variable.1

 INPUT$
 Reads a string of characters from a file.

 LINE INPUT #
 Reads a record and stores it in a single string variable.1

 GET
 Reads data from a file and assigns the data to elements of a user-defined
 variable.2


 Getting information about a file
 --------------------------------
 EOF
 Tests whether all data has been read from a file.

 FILEATTR
 Returns the number assigned by the operating system to an open file and a
 number that indicates the mode in which the file was opened (input, output,
 append, binary, random, or ISAM).

 LOC
 Gives the current position within a file. With binary access, this is the
 byte position. With sequential access, this is the byte position divided by
 128. With random access, this is the record number of the last record read
 or written.

 LOF
 Gives number of bytes in open file.

 SEEK Function
 Gives the location where the next I-O operation will take place. With random
 access, this is the number of the next record to be read or written. With
 all other kinds of file access, this is the byte position of the next byte
 to be read or written.


 Moving around in a file
 -----------------------
 SEEK Statement
 Sets the byte position or record number for the next read or write operation
 in an open file.


 Managing disk drives, directories, and files
 --------------------------------------------
 CHDRIVE
 Changes the current drive.

 CURDIR$
 Gives current directory specifica-tion for specified drive (or current drive
 if no drive is specified).

 DIR$
 On first call, returns the first file that matches the file specification.
 On successive calls (with no argument), returns remaining files matching the
 file specification.

 FILES
 Prints a listing of the files in a specified directory.

 FREEFILE
 Returns next available file number.

 KILL
 Deletes a file from the disk.

 NAME
 Changes a file's name.
 1     For use with sequential files.
 2     For use with binary or random-access files.