Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Delete line if pattern not found

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Delete line if pattern not found
# 1  
Old 07-12-2009
Delete line if pattern not found
I thought that this was going to be quit simple using sed but i wasn't able to find a way to delete the second line of a text file if my pattern was not found in the line
With awk i am completly useless Smilie

Any ideas?
# 2  
Old 07-12-2009
Code:
kindly give the input and the desired output



---------- Post updated at 06:11 AM ---------- Previous update was at 05:27 AM ----------

use below , and write the code as you can see it in below (same syntax) :-


Code:
sed  ' 2 {
/Pattern/ !d

}
'  input.txt

BR
This User Gave Thanks to ahmad.diab For This Post:
# 3  
Old 07-12-2009
Thanks ahmad.diab!!!

Your command worked fine

Code:
sed '2{/pattern/!d}'

(!) is telling sed what not to look for... is that correct?

Thanks again
Last edited by jepeto; 07-12-2009 at 08:47 AM.. Reason: fixed the command
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

If first pattern is found, look for second pattern. If second pattern not found, delete line

I had a spot of trouble coming up with a title, hopefully you'll understand once you read my problem... :) I have the output of an ldapsearch that looks like this: dn: cn=sam,ou=company,o=com uidNumber: 7174 gidNumber: 49563 homeDirectory: /home/sam loginshell: /bin/bash uid: sam... (2 Replies)
Discussion started by: samgoober
2 Replies

2. Shell Programming and Scripting

Append next line to previous line when one pattern not found

Hi, I need help for below scenario.I have a flat file which is having records seperated by delimiters which will represent each record for oracle table.My Control file will consider each line as one record for that table. Some of the lines are aligned in two/three lines so that records are... (4 Replies)
Discussion started by: kannansr621
4 Replies

3. Shell Programming and Scripting

prompt to delete each record when pattern is found

Hello!. I am working on a very simple program and I have been trying different things. This is so far what I have done and there is one small detail that still does not work. It finds all the records in a phonebook per say: ./rem Susan More than one match; Please select the one to remove: ... (3 Replies)
Discussion started by: bartsimpsong
3 Replies

4. UNIX for Dummies Questions & Answers

Replace line with found unknown pattern

Hi, I have a file with the following content: --------- a 3242 tc_5 gdfg4 random text a 3242 tc_6 gdfg4 random text a 3242 tc_7 gdfg4 random text a 3242 tc_4 gdfg4 --------- I want to replace the lines containing tc_? (tc_5, tc_6 etc. even with unknown numbers) with the found... (5 Replies)
Discussion started by: joas
5 Replies

5. Shell Programming and Scripting

To find the line no, where the particular pattern is not found

Hi, suppose i have a txt file containing thye following data 2012156|sb3|nwknjps|BAYONNE|NJ|tcg 201221|094|mtnnjprc:HACKENSACK|NJ|tcg 201222|wn3|mtnnjtc|HACKENSACK|NJ|tcg 2018164|ik4|mtnntc|JERSEY CITY|NJ|tcg 20123482|ik4|mtnnjpritc,JERSEY CITY|NJ|tcg... (3 Replies)
Discussion started by: priyanka3006
3 Replies

6. Shell Programming and Scripting

How to replace a line below where the pattern found

Hi All, I have a file say abc.xml. In this file, I need to search for a pattern “SAP_GATEWAY_HOST”; if this pattern found and the next line also contain the pattern “nwprc03.cos” then I need to replace this pattern “nwprc03.cos” with some other pattern “nwdrc03.apjp”. $ cat abc.xml... (3 Replies)
Discussion started by: Ritesh.patni84
3 Replies

7. Shell Programming and Scripting

find pattern, delete line with pattern and line above and line below

I have a file that will sometimes contain a pattern. The pattern is this: FRM CHK 0000 I want to find any lines with this pattern, delete those lines, and also delete the line above and the line below. (4 Replies)
Discussion started by: nickg
4 Replies

8. UNIX for Dummies Questions & Answers

find pattern delete line with pattern and line above and line below

I have a file that will sometimes contain a pattern. The pattern is this: W/D FRM CHK 00 I want to find any lines with this pattern, delete those lines, and also delete the line above and the line below. (1 Reply)
Discussion started by: nickg
1 Replies

9. Shell Programming and Scripting

comment/delete a particular pattern starting from second line of the matching pattern

Hi, I have file 1.txt with following entries as shown: 0152364|134444|10.20.30.40|015236433 0233654|122555|10.20.30.50|023365433 ** ** ** In file 2.txt I have the following entries as shown: 0152364|134444|10.20.30.40|015236433 0233654|122555|10.20.30.50|023365433... (4 Replies)
Discussion started by: imas
4 Replies

10. Shell Programming and Scripting

Delete a block of text delimited by blank lines when pattern is found

I have a file which contains blocks of text - each block is a multi-lines text delimited by blank lines eg. <blank line> several lines of text ... pattern found on this line several more lines of text ... <blank line> How do you delete the block of text (including the blank lines) when... (17 Replies)
Discussion started by: gleu
17 Replies
Login or Register to Ask a Question