Sponsored Content
Top Forums Shell Programming and Scripting Problem getting Nth match in sed Post 302909921 by Zel2008 on Monday 21st of July 2014 11:00:28 AM
Old 07-21-2014
Problem getting Nth match in sed

Hi all,

I'm trying to create a sed command to get the Nth instance of an XML tag in a string, but thus far I can only ever seem to get the last one.

Given an XML string:
Code:
<Wrap><GrayLevel>a</GrayLevel><GrayLevel>b</GrayLevel></Wrap>

I tried to do this on the command line to get each GrayLevel (yes, I know it's messy, these were just the examples I was trying):

Code:
echo "<Wrap><GrayLevel>a</GrayLevel><GrayLevel>b</GrayLevel></Wrap>" | sed -e "s/.*<GrayLevel[^>]*>\(.*\)<\/GrayLevel>.*/\1/1"
echo "<Wrap><GrayLevel>a</GrayLevel><GrayLevel>b</GrayLevel></Wrap>" | sed -e "s/.*<GrayLevel[^>]*>\(.*\)<\/GrayLevel>.*/\1/2"

I expected to get the following from these examples:

Code:
a
b

But instead I got:

Code:
b
<Wrap><GrayLevel>a</GrayLevel><GrayLevel>b</GrayLevel></Wrap>

Can anyone explain to me what I'm doing wrong, please? I'm guessing it's something with the match parameter, but I can't figure out what.

Thanks,
Zel2008
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sed problem - delete all lines until a match on 2 lines

First of all, I know this can be more eassily done with perl or other scripting languages but, that's not the issue. I need this in sed. (or wander if it's possible ) I got a file (trace file to recreate the control file from oracle for the dba boys) which contains some lines another line... (11 Replies)
Discussion started by: plelie2
11 Replies

2. Shell Programming and Scripting

Getting filename for Nth line pattern match

Hi, I have many scripts in particular directory. And few of the scripts have exit 0 in second line. Now i wanted to list out the scripts name which has the exit 0 in its second line I tried many options , but i can not get the filename along with the nth line pattern match :mad:. Can anyone... (14 Replies)
Discussion started by: puni
14 Replies

3. Shell Programming and Scripting

sed pattern match problem

Hi all, hoping this is a simple one, tried looking but just can't see the solution As an example I've got a list of words that all start Ben..... Bendicks Benefiber Ben Benylin I need to only change the line Ben with Ben 10, ignoring the other lines. I tried the following ... (1 Reply)
Discussion started by: mrpugster
1 Replies

4. UNIX for Dummies Questions & Answers

finding the nth match

I have a file that has information for a person....each person gets 3 or more lines to describe them. I was hoping to match person 1, then person 2.....BUT I do not know how to tell grep I only want the first (2nd, 3rd or nth) match. The alternative is doing line by line logic, which is fine... (8 Replies)
Discussion started by: countryStyle
8 Replies

5. Shell Programming and Scripting

search pattern and replace x-y characters in nth line after every match

Hi, I am looking for any script which can do the following. have to read a pattern from fileA and copy it to fileB. fileA: ... ... Header ... ... ..p1 ... ... fileB: .... .... Header (3 Replies)
Discussion started by: anilvk
3 Replies

6. Shell Programming and Scripting

problem using sed to match a string

Hi There! I'm stuck with a problem trying to output some sections of a rss feed to my conky program using curl and sed. The rss feed is for tide times and I wish to output the times but not the rest to the conky desktop. To do this I need to pull out the four instances of times that are in... (4 Replies)
Discussion started by: huffpuff
4 Replies

7. UNIX for Dummies Questions & Answers

Printing nth and n+1th line after a pattern match

Hi , I want to print the nth and n+1 lines from a file once it gets a pattern match. For eg: aaa bbb ccc ddd gh jjjj If I find a match for bbb then I need to print bbb as well as 3rd and 4th line from the match.. Please help..Is it possible to get a command using sed :) (6 Replies)
Discussion started by: saj
6 Replies

8. Shell Programming and Scripting

How to display when nth line match a pattern?

Hi All, I have sample of listing as following Database 2 entry: Database alias = PXRES Database name = PXRES Local database directory = /db2/data1/db2phnx Database release level = d.00 Comment ... (3 Replies)
Discussion started by: ckwan
3 Replies

9. Shell Programming and Scripting

sed : replace Nth match in a file

I have a situation where a file "config.txt" looks like this Servername: OS: Serername: OS: Servername: OS: .... .... ... Servername: OS: looking for the sed syntax to replace the "Nth" occurrence of Servername (i would apply the same logic to OS as well), want to replace the Nth... (4 Replies)
Discussion started by: alldbest
4 Replies

10. AIX

Print nth previous line after match

Please help me print nth line after match awk or sed one line command. (3 Replies)
Discussion started by: sushma123
3 Replies
IRSEND(1)							   User Commands							 IRSEND(1)

NAME
irsend - basic LIRC program to send infra-red commands SYNOPSIS
irsend [options] DIRECTIVE REMOTE CODE [CODE...] DESCRIPTION
Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such as TV boxes, HiFi sets, etc. DIRECTIVE can be: SEND_ONCE - send CODE [CODE ...] once SEND_START - start repeating CODE SEND_STOP - stop repeating CODE LIST - list configured remote items SET_TRANSMITTERS - set transmitters NUM [NUM ...] SIMULATE - simulate IR event REMOTE is the name of a remote, as described in the lircd configuration file. CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file. NUM is the transmitter number of the hardware device. For the LIST DIRECTIVE, REMOTE and/or CODE can be empty: LIST "" "" - list all configured remote names LIST REMOTE "" - list all codes of REMOTE LIST REMOTE CODE - list only CODE of REMOTE The SIMULATE command only works if it has been explicitly enabled in lircd. -h --help display usage summary -v --version display version -d --device use given lircd socket [/var/run/lirc/lircd] -a --address=host[:port] connect to lircd at this address -# --count=n send command n times EXAMPLES
irsend LIST DenonTuner "" irsend SEND_ONCE DenonTuner PROG-SCAN irsend SEND_ONCE OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3 irsend SEND_STOP OnkyoAmpli VOL-DOWN irsend SET_TRANSMITTERS 1 irsend SET_TRANSMITTERS 1 3 4 irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S" FILES
/etc/lirc/lircd.conf Default lircd configuration file. It should contain all the remotes, their infra-red codes and the corresponding timing and wave- form details. DIAGNOSTICS
If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics: "irsend: could not connect to socket" "irsend: Connection refused" (or "Permission denied"). SEE ALSO
The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory. lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org. irsend 0.9.0-pre1 October 2010 IRSEND(1)
All times are GMT -4. The time now is 01:31 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy