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Top Forums Shell Programming and Scripting Sed delete certain number of empty lines Post 302541791 by duonut on Monday 25th of July 2011 06:29:02 PM
Old 07-25-2011
Quote:
Originally Posted by h@foorsa.biz
You can loop 4 times over sed
Code:
for i in 1 2 3 4
do
sed '/^$/d'
done

Hi


that didn't work, it just goes in a loop 4 times removing all empty lines from the file.

I guess an example input -> output would be:

Input
Code:
1

2

3

4

5

6

Output:
Code:
1
2
3
4

5

6

 

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

NAME
insdelln, winsdelln - insert/delete lines to/from the 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 insdelln(int n); int winsdelln(WINDOW *win, int n); PARAMETERS
n Is the number of lines to insert or delete (positive n inserts; negative n deletes). win Is a pointer to the window in which to insert or delete a line. DESCRIPTION
The insdelln() and winsdelln() functions insert or delete blank lines in stdscr or win, respectively. When n is positive, n lines are added before the current line and the bottom n lines are lost; when n is negative, n lines are deleted starting with the current line, the remaining lines are moved up, and the bottom n lines are cleared. The position of the cursor does not change. 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
deleteln(3XCURSES), insertln(3XCURSES), libcurses(3XCURSES), attributes(5), standards(5) SunOS 5.11 5 Jun 2002 insdelln(3XCURSES)
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