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Full Discussion: Clearing file contents
Special Forums Hardware Filesystems, Disks and Memory Clearing file contents Post 302073845 by raghukayyar on Thursday 18th of May 2006 07:15:58 AM
Old 05-18-2006
Clearing file contents

Hi,

We need to clear the contents of a file. For this we tried using the commands like - '>filename' and 'cat filename > /dev/null'.

If the file size is large, the above commands will clear the file contents but the size of the file remains the same (checked using the command 'ls -l filename').

Are there any other UNIX commands which will empty the file contents?

Regards,
Raghavendra
 

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scr_dump(3XCURSES)					  X/Open Curses Library Functions					scr_dump(3XCURSES)

NAME
scr_dump, scr_init, scr_restore, scr_set - write screen contents to/from a file SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib -R /usr/xpg4/lib -lcurses [ library... ] c89 [ flag... ] file... -lcurses [ library... ] #include <curses.h> int scr_dump(const char *filename); int scr_init(const char *filename); int scr_restore(const char *filename); int scr_set(const char *filename); PARAMETERS
filename Is a pointer to the file in which screen contents are written. DESCRIPTION
These function perform input/output functions on a screen basis. The scr_dump() function writes the contents of the virtual screen, curscr, to filename. The scr_restore() function reads the contents of filename from curscr (which must have been written with scr_dump()). The next refresh operation restores the screen to the way it looks in filename. The scr_init() function reads the contents of filename and uses those contents to initialize the X/Open Curses data structures to what is actually on screen. The next refresh operation bases its updates on this data, unless the terminal has been written to since filename was saved or the terminfo capabilities rmcup and nrrmc are defined for the current terminal. The scr_set() function combines scr_restore() and scr_init(). It informs the program that the contents of the file filename are what is currently on the screen and that the program wants those contents on the screen. RETURN VALUES
On success, these functions return OK. Otherwise, they return ERR. ERRORS
None. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
delscreen(3XCURSES), doupdate(3XCURSES), endwin(3XCURSES), getwin(3XCURSES), libcurses(3XCURSES), attributes(5), standards(5) SunOS 5.11 5 Jun 2002 scr_dump(3XCURSES)
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