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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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curs_deleteln(3X)														 curs_deleteln(3X)

NAME
deleteln, wdeleteln, insdelln, winsdelln, insertln, winsertln - delete and insert lines in a curses window SYNOPSIS
#include <curses.h> int deleteln(void); int wdeleteln(WINDOW *win); int insdelln(int n); int winsdelln(WINDOW *win, int n); int insertln(void); int winsertln(WINDOW *win); DESCRIPTION
The deleteln and wdeleteln routines delete the line under the cursor in the window; all lines below the current line are moved up one line. The bottom line of the window is cleared. The cursor position does not change. The insdelln and winsdelln routines, for positive n, insert n lines into the specified window above the current line. The n bottom lines are lost. For negative n, delete n lines (starting with the one under the cursor), and move the remaining lines up. The bottom n lines are cleared. The current cursor position remains the same. The insertln and winsertln routines, insert a blank line above the current line and the bottom line is lost. RETURN VALUE
All routines return the integer ERR upon failure and an OK (SVr4 specifies only "an integer value other than ERR") upon successful comple- tion. PORTABILITY
These functions are described in the XSI Curses standard, Issue 4. The standard specifies that they return ERR on failure, but specifies no error conditions. NOTES
Note that all but winsdelln may be macros. These routines do not require a hardware line delete or insert feature in the terminal. In fact, they won't use hardware line delete/insert unless idlok(..., TRUE) has been set on the current window. SEE ALSO
curses(3X) curs_deleteln(3X)
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