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Top Forums Shell Programming and Scripting sed/awk : how to delete lines based on IP pattern ? Post 302565275 by otheus on Monday 17th of October 2011 12:03:50 PM
Old 10-17-2011
Once you know the sed command works as expected, you can use the -i option to replace the file you just edited.

Also, Shell_Life's example makes one big mistake: using unescaped periods (.) to represent the dot in an IP address. That can lead to big problems. Make sure you escape all periods like this:

Code:
sed -i '/152\.15\.3\.4/d;'

Another "gotcha" with the above example is that it will also nail ip addresses like "152.15.3.42". Since that's probably not what you want, do this:
Code:
sed -i '/^152\.15\.3\.4[\t ]/d;'

This makes sure that the 4 precedes a tab or space.
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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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