Search IP Address in list of ranges -- not working great Post: 302601072

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Top Forums Shell Programming and Scripting Search IP Address in list of ranges -- not working great Post 302601072 by agama on Wednesday 22nd of February 2012 11:01:17 PM

02-23-2012

Registered User

An awk based solution along the same lines as the perl posted by balajesuri.
Searches for IP address passed in as $1 to the script. Optionally pass in the file to search, or redirect it in from stdin.

Code:

#!/usr/bin/env ksh

grep ${1%%.*} $2 | awk -v target=$1 '
    function toi( str,  a )
    {
        split( str, a, "." );
        return sprintf( "%d%03d%03d%03d", a[1], a[2], a[3], a[4] ) +0;
    }

    BEGIN { tvalue = toi( target ); }

    NF > 1 {
        if( tvalue >= toi( $1 )  &&   tvalue <= toi( $2 ) )
        {
            matched = $0;
            exit( 0 );
        }
    }
    END {
        if( matched )
            printf( "%s is in range: %s\n", target, $0 );
        else
            printf( "%s is OK\n", target );
    }
'

And before any flames are thrown about not needing the grep... No, it's not needed, but I assume it's faster to let awk munge a subset of the input rather than munging the whole input list.

Last edited by jim mcnamara; 02-23-2012 at 06:04 PM..

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LEARN ABOUT DEBIAN

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)