using regular shell variable inside awk

nuser · 06-09-2012, 11:42 AM

After many experiments, I need help!Please tell me how to work the following example..

Code:

var=$(cat t.log|awk '!/</'|tail -1) 
cat t.log|awk '/$var/,0'

awk not see $var!Why? And most important how to do it?

The main task is a list of url addresses (equal) to remove those whose port is serial
examle:

Code:

http://ex.com:101
http://ex.com:105
http://ex.com:103
http://ex.com:11 #for remove
http://ex.com:12 #
http://ex.com:13 #
http://ex.com:14 #

pixellany · 06-10-2012, 07:38 AM

single quotes (AKA "hard quotes") protect everything from the shell. If you use double quotes, then the variable expansion will work.