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Top Forums Shell Programming and Scripting Removing all lines prior to the last pattern in a file/stream Post 302503785 by mirni on Friday 11th of March 2011 04:30:50 PM
Old 03-11-2011
My solution would be to scan the output twice -- so that I can identify which pattern is the last one. Something like this:
Code:
lastOccur=`sed -n '/pattern/=' output | tail -1` #will output line numbers matching pattern
sed -n "$lastOccur,$ p" output

---------- Post updated at 11:30 AM ---------- Previous update was at 11:27 AM ----------

Ahhh... 'tac' ... nice one. Then you can do:

Code:
tac output | sed  "/pattern/,$ d" | tac

 

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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 5.10 5 Jun 2002 insdelln(3XCURSES)
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