Visit Our UNIX and Linux User Community

Grep with 8 lines before and after pattern.

Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Grep with 8 lines before and after pattern.
# 1  
Old 08-07-2009
Grep with 8 lines before and after pattern.

OK. I have a file I'd like to be able to grep, but on top of returning the line where the pattern matches, I'd like to be able to get the previous 8 lines and the following 8 lines. Is there a way to do this?
# 2  
Old 08-07-2009
you can use grep -n option to grep the line number .

Then using that line number as variable you can use head and tail to get the +/- 8 lines
# 3  
Old 08-07-2009

Some versions of grep have a -A and -B option:

From the (RedHat) Grep man page:

-A NUM, --after-context=NUM
Print NUM lines of trailing context after matching lines.

-B NUM, --before-context=NUM
Print NUM lines of leading context before matching lines.

Previous Thread | Next Thread
Test Your Knowledge in Computers #304
Difficulty: Easy
sed is a stream editor and is used to perform basic text transformations on an input stream (a file or input from a pipeline).
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Grep all lines with the pattern .sh

Linux version : Oracle Linux 6.5 Shell : bash In the the below text file (someString.text), I want to grep all lines with .sh in it. ie. Only the lines and should be returned. My below attempts failed. I gather that in regular expression world, dot (.) is the... (3 Replies)
Discussion started by: John K
3 Replies

2. Shell Programming and Scripting

Find pattern; grep n lines before and after

Hi, I need help to grep a specific part of a log file (bold). 24/2/2017-16:57:17.056 frosti-1 M3UA-Tx: } 24/2/2017-16:57:17.056 frosti-1 M3UA-Tx: extensionContainer <Not Present> 24/2/2017-16:57:17.056... (8 Replies)
Discussion started by: vasil
8 Replies

3. Shell Programming and Scripting

Grep pattern only and surrounding lines

Hello, I am trying to grep search a pattern and a line before it. cat input >record1 hello1hello2hellonhello3 >record2 helloohello1hello2hello3 When I use, grep with -o option and either of -A/B/C options, I still can't see lines before or after the pattern. But the exact pattern is... (5 Replies)
Discussion started by: jacobs.smith
5 Replies

4. UNIX for Dummies Questions & Answers

Grep -v lines starting with pattern 1 and not matching pattern 2

Hi all! Thanks for taking the time to view this! I want to grep out all lines of a file that starts with pattern 1 but also does not match with the second pattern. Example: Drink a soda Eat a banana Eat multiple bananas Drink an apple juice Eat an apple Eat multiple apples I... (8 Replies)
Discussion started by: demmel
8 Replies

5. Shell Programming and Scripting

Grep lines before a pattern having some other pattern

Hi All, I am trying to fetch lines before a pattern, I got to know about -B flag in grep but we have to pass the number to get those lines before some pattern say (X), now what if I want to get line/s with some other pattern say (Y) before X pattern? How to get about it? please help. Input:... (5 Replies)
Discussion started by: dips_ag
5 Replies

6. Shell Programming and Scripting

Grep pattern and display all lines below

Hi I need to grep for a patter and display all lines below the pattern. For ex: say my file has the below lines file1 file2 file3 file4 file5 I NEED to grep for patter file3 and display all lines below the pattern. do we have an option to get this data. Let me know if you require... (5 Replies)
Discussion started by: venkidhadha
5 Replies

7. Shell Programming and Scripting

Grep the word from pattern line and update in subsequent lines till next pattern line reached

Hi, I have got the below requirement. please suggest. I have a file like, Processing Item is: /data/ing/cfg2/abc.txt /data/ing/cfg3/bgc.txt Processing Item is: /data/cmd/for2/ght.txt /data/kernal/config.klgt.txt I want to process the above file to get the output file like, ... (5 Replies)
Discussion started by: rbalaj16
5 Replies

8. Shell Programming and Scripting

grep: get last 3 lines containing PATTERN from many files

Hi all, I am looking for a quick solution for this: I have many log files of an iterative program, and I would like to display the parameters of the last three iteration from each of those files. Relevant lines have the keyword: ITER I am using: tac ~/modeling*/fitting.log | grep -m 3 -e... (2 Replies)
Discussion started by: pnemeth
2 Replies

9. Shell Programming and Scripting

Print the above and below lines for the grep pattern.

Hi, i would like to get the above and below lines of the grep pattern . For ex : file as below: chk1- aaaa 1-Nov chk2 -aaaa ########## chk1-bbbbbb 1-Nov chk2-bbbbbb ######### my search pattern is date : 1-Nov i need the o/p as below chk1- aaaa 1-Nov (6 Replies)
Discussion started by: expert
6 Replies

10. Shell Programming and Scripting

grep to show lines only after pattern

When i grep for a pattern the search results comes up with matching lines(some before the pattern and some after) can i limit the search so that it shows only the lines after the pattern specified (5 Replies)
Discussion started by: wannalearn
5 Replies

Featured Tech Videos