Remove multiple lines from a text file

Tags

shell scripts

Top Forums Shell Programming and Scripting Remove multiple lines from a text file

05-21-2014

Registered User

260, 9

Join Date: Jul 2007

Last Activity: 21 January 2020, 11:19 PM EST

Posts: 260

Thanks Given: 39

Thanked 9 Times in 9 Posts

Remove multiple lines from a text file

Hi

I have a text file named main.txt with 10,000 lines. I have another file with a list of line numbers (around 1000) of the lines to be deleted from main.txt file.

I tried with sed but it removes only a range of line numbers.

Thanks for any help!!

prvnrk

View Public Profile for prvnrk

Find all posts by prvnrk

05-21-2014

Registered User

559, 160

Join Date: Jul 2012

Last Activity: 20 September 2019, 7:24 AM EDT

Location: India, Hyderabad

Posts: 559

Thanks Given: 11

Thanked 160 Times in 148 Posts

Code:

awk 'NR == FNR {a[$0]; next}
  {if(! (FNR in a)) {print}}' list.txt main.txt

This User Gave Thanks to SriniShoo For This Post:

SriniShoo

View Public Profile for SriniShoo

Find all posts by SriniShoo

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Remove newline character from column spread over multiple lines in a file

Hi, I came across one issue recently where output from one of the columns of the table from where i am creating input file has newline characters hence, record in the file is spread over multiple lines. Fields in the file are separated by pipe (|) delimiter. As header will never have newline...

2. Shell Programming and Scripting

Using awk to remove lines from file that match text

I am trying to remove each line in which $2 is FP or RFP. I believe the below will remove one instance but not both. Thank you :). file 12 123 FP 11 10 RFP awk awk -F'\t' ' $2 != "FP"' file desired output 12 11

3. Shell Programming and Scripting

How to search multiple patterns and remove lines from a file?

Hi, I have a file content as below. Table : PAYR Displayed fields: 15 of 15 Fixed columns: 4 List width 0999...

4. UNIX for Dummies Questions & Answers

How to grep multiple lines from a text file using another text file?

I would like to use grep to select multiple lines from a text file using a single-column text file. Basically I want to only select lines from the first text file where the second column of the first text file matches the second text file. How do I go about doing that? Thanks!

5. Shell Programming and Scripting

Process multiple lines in a text file

Hi All I have text file like this: a=21ej c=3tiu32 e=hydkehw f=hgdiuw g=jhdkj a=klkjhvl b=dlkjhyfd a=yo c=8732 Any way I can process data from first a to just before of second a, and then second a to just before of 3rd one. Just fetching records like that will help, I mean...

6. UNIX for Dummies Questions & Answers

How to generate multiple lines in a text file?

Hello, I want to create a file whose content is multiple lines of strings. The string has the following pattern: aaaa/bbbb/A-B.txt A is a variable ranges from A1 to A2 B is a variable ranges from B1 to B2 Any ideas? Thanks.

7. Shell Programming and Scripting

Remove multiple lines in the file

Hi, How to remove duplicate lines in the file. a ------ b c 24 23 a ---- c b

8. UNIX for Dummies Questions & Answers

Remove blank lines and comments from text file

Hi, I am using BASH. How can I remove any lines in a text file that are either blank or begin with a # (ie. comments)? Thanks in advance. Mike

9. Shell Programming and Scripting

[bash help]Adding multiple lines of text into a specific spot into a text file

I am attempting to insert multiple lines of text into a specific place in a text file based on the lines above or below it. For example, Here is a portion of a zone file. IN NS ns1.domain.tld. IN NS ns2.domain.tld. IN ...

10. Shell Programming and Scripting

Need to remove multiple text from a single file

Dear all, I have a file which have let us say records from A-Z. Now I want to remove multiple letter from this file using single command.. let us say I want to remove A,F,K,Y,U,P,B,S,D. I can use grep -v command but for this case i need to rerun the file several time i wana avoid using...

Shell Programming and Scripting