clear a file in PERL Post: 302202929

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How can I clear a line of a file?

Hello, I want to clear or modify a line of a file. It is possible by cat filename | sed '3d' for example. But If I want "3" to be a variable? I can't do sed '$var d' Help me please Thank you very much

2. UNIX for Advanced & Expert Users

Clear log file in use.

Hai, I have a program which updates the result in a log file, as the program runs 24*7,the size of log file keeps on increasing. Can you help me with a shell command which will clear the content of a log file in use. 1) I tried tail -10 logfile > logfile ( the content is not changed ) 2) >...

3. Linux

SED/AWK Script to clear log file using timestamp?

I have a log file on our system which fills up with lines that have been timestamped, as follows.... 03/03/2008 10:56:06:815] (ERROR) balance: continuing session to genapp02 : 18500 03/03/2008 10:56:06:820] (ERROR) balance: continuing session to genapp02 : 18500 03/03/2008 10:56:07:003]...

4. Shell Programming and Scripting

How to clear a file

Hello, I have a script which creates a certain text file. Whenever I call it, I need to recreate this file, because I have no need in the previous content. So I thought to remove the file every time I call the script, and that way I am sure that the previous content will not interrupt me....

5. Shell Programming and Scripting

perl -write values in a file to @array in perl

Hi can anyone suggest me how to write a file containing values,... say 19 20 21 22 .. 40 to an array @array = (19, 20, ... 40) -- Thanks

6. Shell Programming and Scripting

clear extra spaces and tabs in a file

Any help appreciated Thanks sample input: > (extra spaces&tabs in here) test1 (extra spaces&tabs in here) 123.123.123.123 (extra spaces&tabs in here) abc (extra spaces&tabs in here) 123 --- < (extra spaces&tabs in...

7. Shell Programming and Scripting

Perl :How to print the o/p of a Perl script on console and redirecting same in log file @ same time.

How can i print the output of a perl script on a unix console and redirect the same in a log file under same directory simultaneously ? Like in Shell script, we use tee, is there anything in Perl or any other option ?

8. Shell Programming and Scripting

How to clear contents of a file without deleting it.

Hi, I have a script which will use an input.txt file as an input file. I am providing data to this input file in the script and once the script is executed, I want to clear all the contents of this file as during the second time use of this script, I'll be appending the data in this input...

9. Shell Programming and Scripting

Tcl and clear case to obtain a file name as variable

proc get_view_rel_str { } { set cc_view :] end]] puts $cc_view set a puts $a set a end]] puts $a set a puts $a set a puts $a set a puts $a } get_view_rel_str this is a script in tcl with clearcase view

10. UNIX for Dummies Questions & Answers

How to clear last 5 characters from 14th field in a file?

Hi, I have a file with 15 fields seperated by '|'. The requirement is to clear the last 5 characters of the 14th field. modifications should be done to the original file . Can some one help me in sorting this out.

LEARN ABOUT SUNOS

wclear

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

NAME

       clear, erase, wclear, werase - clear a window

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 clear(void);

       int erase(void);

       int wclear(WINDOW *win);

       int werase(WINDOW *win);

DESCRIPTION

       The  clear()  and  erase()  functions clear stdscr,  destroying its previous contents. The wclear() and werase() functions perform the same
       action,	but clear the window specified by win instead of stdscr.

       The clear() and wclear() functions also call the clearok() function. This function clears and redraws the entire screen on the next call to
       refresh(3XCURSES) or wrefresh(3XCURSES) for the window.

       The current background character (and attributes) is used to clear the screen.

PARAMETERS

       win	       Is a pointer to the window that is to be cleared.

ERRORS

       OK	       Successful completion.

       ERR	       An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       bkgdset(3XCURSES),  clearok(3XCURSES),  clrtobot(3XCURSES), clrtoeol(3XCURSES), doupdate(3XCURSES), libcurses(3XCURSES), refresh(3XCURSES),
       wrefresh(3XCURSES), attributes(5), standards(5)

SunOS 5.10							    5 Jun 2002							   clear(3XCURSES)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How can I clear a line of a file?

Discussion started by: Nene

2. UNIX for Advanced & Expert Users

Clear log file in use.

Discussion started by: coolbhai

3. Linux

SED/AWK Script to clear log file using timestamp?

Discussion started by: davesimm

4. Shell Programming and Scripting

How to clear a file

Discussion started by: shira