Visit Our UNIX and Linux User Community

Operating Systems Solaris grep and display few lines before and after Post 302098992 by Ygor on Thursday 7th of December 2006 07:38:57 PM
Old 12-07-2006
Try...
Code:
nawk 'c-->0;$0~s{if(b)for(c=b+1;c>1;c--)print r[(NR-c+1)%b];print;c=a}b{r[NR%b]=$0}' b=2 a=4 s="string" file1

...where "b" and "a" are the number of lines to print before and after string "s".

---edit----

It's not the best generic solution because it can't handle the case if the search string is repeated in the "before" lines.

A better way...
Code:
nawk '$0~s{for(c=NR-b;c<=NR+a;c++)r[c]=1}{q[NR]=$0}END{for(c=1;c<=NR;c++)if(r[c])print q[c]}' b=2 a=4 s="string" file1

...where "b" and "a" are the number of lines to print before and after string "s".

Last edited by Ygor; 05-31-2012 at 08:51 AM.. Reason: Had to update this post because my buggy code is propagating all over the internet.
These 6 Users Gave Thanks to Ygor For This Post:
 
Test Your Knowledge in Computers #71
Difficulty: Easy
Linux, macOS, Android, iOS, Chrome OS, Orbis OS used on the PlayStation 4, whatever firmware is running on your router, all of these operating systems are generally referred to as a Unix-like operating system.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Make grep -c display like grep -n?

Hey Guys, Wondering if there is a way to do the following I have a file called test.txt abc def abc abc def I have a pattern file called pattern.txt containing the following abc def I want to do a count, but have it display the count value preceeding each line like grep -n (2 Replies)
Discussion started by: Jerrad
2 Replies

2. UNIX for Dummies Questions & Answers

Help with "grep", need to display several lines

I have a file from which I need to collect lines to another file. I know how to use 'grep' for this, but I don't know how to do when I wan't several lines after the search word, and the amount of lines I need varies from case to case. The file I search in looks something like this: >8534734... (9 Replies)
Discussion started by: Draken
9 Replies

3. UNIX for Dummies Questions & Answers

Grep and display n lines after the match is found.

Hello, How do I use grep to find a pattern in a list of file and then display 5 lines after the pattern is matched Eg: I want to match the string GetPresentCode in all files in a folder and then see 4 lines following this match. I am not sure if grep is what should be used to achieve. Thanks!... (3 Replies)
Discussion started by: cv_pan
3 Replies

4. Shell Programming and Scripting

grep and display lines from a file

I have to grep on a few words in a file and then display the line containing those words and the line above it. For ex - File1.txt contains... abc xyz abc This is a test Test successful abc xyz abc Just a test Test successful I find the words 'Test successful' in the file... (6 Replies)
Discussion started by: user7617
6 Replies

5. UNIX for Dummies Questions & Answers

Using grep and zgrep then display the next few lines

Hello everyone. I would like to know if I can use grep or zgrep to search for a particular pattern then print the x number of lines after the pattern was found. Lets say for example a pattern was found on line 3, I wanted the output to show lines 3, 4 and 5. Thanks! (10 Replies)
Discussion started by: khestoi
10 Replies

6. Shell Programming and Scripting

Grep word after last occurance of string and display next few lines

Hi, I wanted to grep string "ERROR" and "WORNING" after last occurrence of String "Starting" only and wanted to display two lines after searched ERROR and WORNING string and one line before. I have following cronjob log file "errorlog" file and I have written the code for same in Unix as below... (17 Replies)
Discussion started by: nes
17 Replies

7. Shell Programming and Scripting

Grep multiple exact match, do not display lines

Hi, Need help to grep the following from a file x. I just want to grep exact match not lines and not partial word. CONFSUCCESS CONFFAIL CONFPARTIALSUCCESS >cat x xczxczxczc zczczcxx CONFSUCCESS czczczcczc czxxczxzxczcczc CONFFAIL xczxczcxcczczc zczczczcz CONFPARTIALSUCCESS czczxcxzc ... (4 Replies)
Discussion started by: rajeshwebspere
4 Replies

8. 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

9. Shell Programming and Scripting

Grep and display multiple lines

Hi guys, I have a log file that generates multiple logs about a query. <query time='2016-04-13 13:01:50.825'> <PagingRequestHandler> <Before>brand:vmu</Before> <After>brand:vmu</After> </PagingRequestHandler> <GroupDeviceFilterHandler> <Before>brand:vmu</Before> ... (3 Replies)
Discussion started by: Junaid Subhani
3 Replies

10. Shell Programming and Scripting

Display lines for a particular year in a file using grep

hi, I have a log file with data for more than 3 years, i want only the rows for the year 2017, say for example. My file has the data like this 08-OCT-2015 11:17:35 AAA, BBBB 08-OCT-2017 11:17:35 AAA,Bdfdfd,dfdfd,dfd 08-Nov-2017 11:17:35 AAA,Bdfdfd,dfdfd,deree i want the rows... (2 Replies)
Discussion started by: skoshekay
2 Replies
ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD

Featured Tech Videos

All times are GMT -4. The time now is 08:04 AM.
Unix & Linux Forums Content Copyright 1993-2021. All Rights Reserved.
Privacy Policy