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Full Discussion: performance issue
Top Forums Shell Programming and Scripting performance issue Post 302172176 by matrixmadhan on Monday 3rd of March 2008 01:29:42 AM
Old 03-03-2008
file input / output - ( fopen and fclose )
are the minimum granularity of reading a file.

Even if shell script is used, internally fopen and fclose are used without the conscious of the user. They are available as implementation abstraction to the user so that user don't have to worry about the file operations instead could think about the application logic alone
 

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FCLOSE(3)						     Linux Programmer's Manual							 FCLOSE(3)

NAME
fclose - close a stream SYNOPSIS
#include <stdio.h> int fclose(FILE *fp); DESCRIPTION
The fclose() function will flushes the stream pointed to by fp (writing any buffered output data using fflush(3)) and closes the underlying file descriptor. RETURN VALUE
Upon successful completion 0 is returned. Otherwise, EOF is returned and errno is set to indicate the error. In either case any further access (including another call to fclose()) to the stream results in undefined behavior. ERRORS
EBADF The file descriptor underlying fp is not valid. The fclose() function may also fail and set errno for any of the errors specified for the routines close(2), write(2) or fflush(3). CONFORMING TO
C89, C99. NOTES
Note that fclose() only flushes the user space buffers provided by the C library. To ensure that the data is physically stored on disk the kernel buffers must be flushed too, for example, with sync(2) or fsync(2). SEE ALSO
close(2), fcloseall(3), fflush(3), fopen(3), setbuf(3) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2009-02-23 FCLOSE(3)
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