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LOF Function Details
 
Syntax
  LOF(filenumber)
 
The argument filenumber is the number used in the OPEN statement.
 
When a file is opened in any mode, the LOF function returns the size of
the file in bytes.
 
LOF cannot be used with the BASIC devices SCRN:, KYBD:, CONS:, and
LPTn:. When used on a device opened as a file with the statement
OPEN COM, the LOF function returns the number of bytes free in the
output buffer.