use of variables in awk to search for pattern from a file

Login or Register for Dates, Times and to Reply

Thread Tools Search this Thread
# 1  
use of variables in awk to search for pattern from a file


I need to extract all the content between two strings stored in two variables "startstring" and "endstring"
awk '/$startstring/, $NF ~ /$endstring/ ' file > file2

The above code is not working with variables. It works when actual string values are used as patterns as below.
awk '/hello/, $NF ~ /world/ ' file > file2

Can someone help me to use these two variables in awk for searching the patterns.


Thanks & Regards,
Moderator's Comments:
Mod Comment Please use code tags!

Last edited by vbe; 11-24-2011 at 05:49 AM..
# 2  
try this ..
$ v1=hello
$ v2=world
$ nawk "/$v1/,/$v2/" infile

This User Gave Thanks to jayan_jay For This Post:
# 3  
Thanks mate, i never knew an apostrophe would change my life altogether Smilie
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #221
Difficulty: Easy
Apple's OS X (macOS) installed base had grown to 80 million users as reported at the WWDC 2014.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Grep/awk using a begin search pattern and end search pattern

I have this fileA TEST FILE ABC this file contains ABC; TEST FILE DGHT this file contains DGHT; TEST FILE 123 this file contains ABC, this file contains DEF, this file contains XYZ, this file contains KLM ; I want to have a fileZ that has only (begin search pattern for will be... (2 Replies)
Discussion started by: vbabz
2 Replies

2. Shell Programming and Scripting

awk search/replace specific field, using variables for regexp & subsitution then overwrite file

Hello, I'm trying the solve the following problem. I have a file which I intend to use as a csv called master.csv The columns are separated by commas. I want to change the text on a specific row in either column 3,4,5 or 6 from xxx to yyy depending upon if column 1 matches a specified pattern.... (3 Replies)
Discussion started by: cyphex
3 Replies

3. Shell Programming and Scripting

Awk to match a pattern and perform a search after the first pattern

Hello Guyz I have been following this forum for a while and the solutions provided are super useful. I currently have a scenario where i need to search for a pattern and start searching by keeping the first pattern as a baseline ABC DEF LMN EFG HIJ LMN OPQ In the above text i need to... (8 Replies)
Discussion started by: RickCharles
8 Replies

4. Shell Programming and Scripting

awk get search pattern from a file.

Here Is a problem I am facing with awk. Query --> I want to search for a string in a file and print next 15 lines below the matched string. 1.We do not have GNU grep so cannot use grep -A or grep -B commands. 2. Instead of passing the search pattern as a string to awk. I want the awk to... (4 Replies)
Discussion started by: togotutor
4 Replies

5. Shell Programming and Scripting

Help to search multiple pattern in file with grep/sed/awk

Hello All, I have a file which is having below type of data, Jul 19 2011 | 123456 Jul 19 2011 | 123456 Jul 20 2011 | 123456 Jul 20 2011 | 123456 Here I wanted to grep for date pattern as below, so that it should only grep "Jul 20" OR "Jul ... (9 Replies)
Discussion started by: gr8_usk
9 Replies

6. Shell Programming and Scripting

Text pattern with AWK and variables

How to to pass variable to the below awk command I would like to pass variables to the awk command instead of the constants "a/cc" but I don't know exactly the correct syntax awk '/a/,/cc/' temp1.out file.txt a b s cc g d output a b s (8 Replies)
Discussion started by: ahmedamro
8 Replies

7. Shell Programming and Scripting

Awk/Sed: Search Pattern from file and Print

Hi, I want to search for patterns (from a file) in a file and print the line matching the patterns and the line before it. I have to search for 100s of patterns from a file. Any help with AWK or Sed. Thanks! (2 Replies)
Discussion started by: saint2006
2 Replies

8. Shell Programming and Scripting

Awk search for string pattern in delimited file

I've got a semicolon delimited file. I would like to search for fields that match a pattern, and not hardcoded eg "mth". *th=something If the delimited field fulfills this condition, eg. mth=value I would like to print out both key and value for some number comparison. eg. if value > "12"... (5 Replies)
Discussion started by: alienated
5 Replies

9. Shell Programming and Scripting

awk pattern search and put in a file

hi I am doing a task that is i have to search for multiple pattern from a file's 9 th column and then redirect it to a new file awk -F, 'BEGIN {OSF=","} { if ($9 == "OTF") print $0}' test1.tsv > test.tsv and the patterns are OST. ODI,MIN LIKE OTF Bit not getting the desired output... (11 Replies)
Discussion started by: pranabrana
11 Replies

10. Shell Programming and Scripting

search and replace using awk with variables

Hi, I have been trying to use awk with variables that needs to search for a pattern and replace it with another pattern, the patterns are supplied in a variable. I have tried several different ways without success and hope that someone can help me. Here are the details echo $UPC 07007457809... (2 Replies)
Discussion started by: jerardfjay
2 Replies

Featured Tech Videos