Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Using Sed to duplicate a section of a file....
Top Forums Shell Programming and Scripting Using Sed to duplicate a section of a file.... Post 302190411 by era on Tuesday 29th of April 2008 03:12:50 PM
Old 04-29-2008
The real hurdle is in expressing more complex logic than "from here through to here". But sed is a programming language, just rather primitive, and very terse (or "succinct", or "unreadable", depending on how you look at it).

So to paraphrase, between section 2 and section 3, you want to print, but not if it's section 3. If expressed this way, it's easy (just not very elegant):

Code:
sed -n '/section 2/,/section 3/{;/section 3/!p;}' input_file

Incidentally, in your original script, the braces were not necessary, but now they are, because there's a block of multiple things we want to happen when the first condition matches.

Just to complete it, why don't you collect section 2 into the hold space, and print it out a second time when you see the section 3 heading:

Code:
sed '/section 2/,/section 3/{;/section 3/!{;H;b;};x;D;p;x;}' input_file

So if we are between section 2 and section 3 (inclusive); then if we are not looking at section 3, append to hold space, and skip to the end of the current script (where the line is implicitly printed the first time); else, recall what's in the hold space, remove the first item (which is empty, because we have been appending to the hold space, and that's what it originally contained), print, and recall back the earlier pattern space (which is the section 3 heading; again, at the end of the script, that line is printed.

This would be way more readable and maintainable in awk or Perl, mind.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sed & awk--get section of file based 2 params

I need to get a section of a file based on 2 params. I want the part of the file between param 1 & 2. I have tried a bunch of ways and just can't seem to get it right. Can someone please help me out.....its much appreciated. Here is what I have found that looks like what I want....but doesn't... (12 Replies)
Discussion started by: Andy Cook
12 Replies

2. Shell Programming and Scripting

Removing Duplicate Lines per Section

Hello, I am in need of removing duplicate lines from within a file per section. File: ABC1 012345 header ABC2 7890-000 ABC3 012345 Header Table ABC4 ABC5 593.0000 587.4800 ABC5 593.5000 587.6580 <= dup need to remove ABC5 593.5000 ... (5 Replies)
Discussion started by: petersf
5 Replies

3. Shell Programming and Scripting

Placing Duplicate Lines per section into another file

Hello, I need help in putting duplicate lines within a section into another file. Here is what I'm struggling with: Using this file “data.txt”: ABC1 012345 header ABC2 7890-000 ABC3 012345 Header Table ABC4 ABC5 593.0000 587.4800 ABC5 593.5000 587.6580 <= dup need to remove ABC5... (4 Replies)
Discussion started by: petersf
4 Replies

4. Shell Programming and Scripting

Duplicate Line Report per Section

I've been working on a script (/bin/sh) in which I have requested and received help here (in which I am very grateful for!). The client has modified their requirements (a tad), so without messing up the script to much, I come once again for assistance. Here are the file.dat contents: ABC1... (4 Replies)
Discussion started by: petersf
4 Replies

5. Shell Programming and Scripting

Extract section of file based on word in section

I have a list of Servers in no particular order as follows: virtualMachines="IIBSBS IIBVICDMS01 IIBVICMA01"And I am generating some output from a pre-existing script that gives me the following (this is a sample output selection). 9/17/2010 8:00:05 PM: Normal backup using VDRBACKUPS... (2 Replies)
Discussion started by: jelloir
2 Replies

6. Shell Programming and Scripting

Delete a section of a file if...

i have a file as below that has n section : 2006 0101 1236 49.3 L 37.902 48.482 0.0 Teh 5 0.2 2.7LTeh 1 GAP=238 E Iranian Seismological Center, Institute of Geophysics, University of Tehran 6 ... (5 Replies)
Discussion started by: oreka18
5 Replies

7. Shell Programming and Scripting

Fetch a section from a file

Hi, I have a file like... $cat file1 +++++++++++++++++++ client1 +++++++++++++++++++++++++++++ col1 col2 col3 ------ ----- ----- (0 rows affected) ========================================================= +++++++++++++++++++ client1 +++++++++++++++++++++++++++++ col1 col2 col3... (6 Replies)
Discussion started by: sam05121988
6 Replies

8. Shell Programming and Scripting

sed - String substitution within specified section in ini type file

Hello. I am trying to modify a config file which is in windows *.ini type file. I have found a piece of code here :linux - Edit file in unix using SED - Stack Overflow As I can't make it doing the job , I am trying to find a solution step by step. here a modified sample file : my_sample.ini... (1 Reply)
Discussion started by: jcdole
1 Replies

9. UNIX for Advanced & Expert Users

How to identify particular section using sed?

Hi, I have following data in a file. Not all but most of the lines start with letter 'T' has 8 SPACES from column 121 to 128 and I want to replace that portion with some dummy value. Is it possible through sed? Input File:- T1111111111111A 20140310000000005076358416369283 AAAAA ... (6 Replies)
Discussion started by: jnrohit2k
6 Replies

10. Shell Programming and Scripting

Section Removal With sed; and With a Twist . . .

Hello folks! Raised a bump on my head trying to figure this one out ;) I have an xml file which needs to be edited, removing an entire property section in the work. Here's what the target section layout looks like: <property name="something"> {any number of lines go here} </property>... (7 Replies)
Discussion started by: LinQ
7 Replies

LEARN ABOUT SUNOS

makesh

MAKESH(1)                                                     General Commands Manual                                                    MAKESH(1)

NAME

       makeSH - a .SH script maker

SYNOPSIS

       makeSH files

DESCRIPTION

       MakeSH  examines  one or more scripts and produces a .SH file that, when run under sh, will produce the original script.  The .SH script so
       produced has two sections containing code destined for the output.  The first section has variable substitutions performed  on  it  (taking
       values  from  config.sh), while the second section does not.  MakeSH does not know which variables you want to have substituted, so it puts
       the whole script into the second section.  It's up to you to insert any variable substitutions in the first section for any values you want
       from config.sh.

       You  should  run  makeSH from within your top-level directory and use the relative path to the file as an argument, so that the "Extracting
       ..." line printed while running the produced .SH file later on will give that same path.

AUTHOR

       Larry Wall <lwall@netlabs.com>

SEE ALSO

       pat(1), metaconfig(1), makedist(1).

BUGS

       It could assume that variables from metaconfig's Glossary need to be initialized in the first section, but I'm too lazy to make it do that.

                                                                       LOCAL                                                             MAKESH(1)
All times are GMT -4. The time now is 10:27 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy