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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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LEARN ABOUT DEBIAN

pclock

PCLOCK(1)						      General Commands Manual							 PCLOCK(1)

NAME

       pclock - pixmap clock

SYNOPSIS

       pclock [options]

DESCRIPTION

       This  manual  page  documents  briefly  the pclock command.  This manual page was written for the Debian GNU/Linux distribution because the
       original program does not have a manual page.

       pclock is a program that places a small analog clock program on the desktop of X.  It was designed to run under the WindowMaker window man-
       ager.  It uses any 64x64 pixmap as a background.

OPTIONS

       The programs follow the usual GNU command line syntax, with long options starting with two dashes (`-') and short optoins starting with one
       dash.  A summary of options is included below.

       -B PIXMAP, --background=PIXMAP
	      Use the given pixmap as the clock background (size must be 64x64).

       -H COLOR, --hands-color=COLOR
	      Draw the hands (hour, minute and second) in the specified color.

       -S COLOR, --second-hand-color
	      Draw the second hand in the specified color

       -h, --help
	      Show summary of options.

       --hour-hand-length=INT
	      Draw the hour hand with the specified length of INT.

       --minute-hand-length=INT
	      Draw the minute hand with the specified length of INT.

       --second-hand-length=INT
	      Draw the second hand with the specified length of INT.

       --second-hand-width=INT
	      Draw the minute hand with the specified width of INT.

       -s, --second-hand
	      Don't display the second hand.

       -v, --version
	      Show version of program.

       -w, --withdrawn
	      Don't start up in a withdrawn (iconic) state.

AUTHOR

       This manual page was written by Darren Benham <gecko@debian.org>, for the Debian GNU/Linux system (but may be used by others).	The  soft-
       ware is copyrighted (c) 1998 by and released under the GPL v2.

       Author: Alexander Kourakos <Alexander@Kourakos.com>
	  Web: http://www.kourakos.com/~awk/pclock/

																	 PCLOCK(1)
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