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Full Discussion: awk search using variable
Top Forums Shell Programming and Scripting awk search using variable Post 302949602 by Aia on Monday 13th of July 2015 07:17:06 PM
Old 07-13-2015
Quote:
Originally Posted by pchang
Hi Forum.

I have the following script that I would like to use a variable to search using awk but it's not working as expected:

Code:
# Define working variables
token_search_string=536088
token_search_length=16

This code example works by hardcoding 536088 in the string search:
awk -v token_search_string=$token_search_string -v token_search_length=$token_search_length '/536088/ {
    match($0, /token_search_string/); print substr($0, RSTART, token_search_length);
}' abc.txt


This code example doesn't work if I reference the token_search_string variable
awk -v token_search_string=$token_search_string -v token_search_length=$token_search_length '/token_search_string/ {
    match($0, /token_search_string/); print substr($0, RSTART, token_search_length);
}' abc.txt

What am I missing here?

Thanks for your help.
Awk does not do variable expansion within regex //
It is, literally, looking for the characters: token_search_string

Try
Code:
awk -v var=$var '$0 ~ var'

when you need to search in that way.

Try
Code:
awk -v token_search_string=$token_search_string -v token_search_length=$token_search_length '{
    match($0, token_search_string); if( RSTART>0 ){print substr($0, RSTART, token_search_length)}
}' abc.txt

Last edited by Aia; 07-13-2015 at 09:25 PM..
 

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