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FCLOSE FCLOSE File Close Function

Usage

Closes a file handle, or all open file handles.  The general syntax
for its use is either

  fclose(handle)

or

  fclose('all')

In the first case a specific file is closed,  In the second, all open
files are closed.  Note that until a file is closed the file buffers
are not flushed.  Returns a '0' if the close was successful and a '-1' if
the close failed for some reason.