sed script to delete the last word after a last pattern match Post: 303033236

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Top Forums UNIX for Beginners Questions & Answers sed script to delete the last word after a last pattern match Post 303033236 by Don Cragun on Tuesday 2nd of April 2019 03:46:44 AM

04-02-2019

Registered User

Quote:

Originally Posted by kshitij

Hi Don

Thanks a lot for your reply! I am using Linux RH-6 .
If we need to match with the second last "/" and delete the lines from the second last "/
then how do we need to tweak the script. ?

Thanks
Kshitij

Hi Kshitij,
From your description above I have no idea which lines it is that you want to delete. In the first problem you presented in this thread you only wanted to remove characters from the end of each line. Now that you want to delete some lines, we need a clear specification of which lines you want to delete.

If you just want to remove another "/" character and the non-"/" characters from the ends of every line, I have already shown you how to do that. Why don't you show me how you would modify the code I suggested to delete the last two "/" characters and the non-"/" characters following them from the end of every line. Assuming that every line has at least two "/" characters (as in your example), there are at least three easy ways to do that.

If some lines might only contain one "/", you need to decide whether you want those lines to be changed at all (removing only the last "/" and the characters following it) or if you don't want to make any changes to a line if there aren't at least two "/" characters on the line. The way to do what you want to do depends on what it is that you want to do and on the data that you will be processing.

Don Cragun

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LEARN ABOUT SUNOS

winsdelln

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)