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Full Discussion: Convert awk line into perl
Top Forums Shell Programming and Scripting Convert awk line into perl Post 302892903 by numele on Saturday 15th of March 2014 03:12:31 PM
Old 03-15-2014
Convert awk line into perl
I have an awk statement in a ksh script that looks for a certain string then looks at each line after to find another match. The match could be the next line or second down and it works well.
Code:
nawk 'BEGIN {FS=RS;RS="!"} /interface loopback0/
{for(i=1;i<=NF; i++) if ($i ~ /ip address/){split($i,a, OFS "|/");print a[3]}}' <file>

I am writing a perl script that I need to capture the same kind of match, but I can not find out how to find the string then look at the next lines until the second match is found. I have put together this together but it only looks at the second line after the string is found, which is where my data is usually but sometimes it is on the first next line.
Code:
my $loopback = "interface loopback0 ";
 
foreach my $host (@HOST){
my $out_fh = "$CONFIG_DIR/$host";
open (FILE, "<$out_fh") or die "Can't open $out_fh";
my @lines = <FILE>;
my $lines; my $i;
for $i(0..$#lines) {
next unless $lines[$i] =~ /$loopback/;
my $a = $i + 2 < 0 ? 0 : $i + 2;;
for $i($a) {
if ($lines[$i] =~ /ip address/) {
my ($out) = (split / /, $lines[$i])[4];
$out = (split /\//, $out)[0];
print "$out\n";
}
}
}
}
close (FILE);

Can someone help me find something that works?

A file example of what the first string finds is like this:
Code:
!
interface loopback0 loopback
description My Router Loopback
ip address 10.30.160.10/32 tag 200
ip source-address tftp ftp 
!
interface loopback1 loopback
description External BGP
ip address 10.159.192.9/32 tag 201
!
interface loopback2 loopback
ip address 10.159.168.33/32 tag 202
ip source-address radius 
!
interface loopback3 loopback
description ID: Management;
ip address 10.81.114.6/32 tag 203
ip source-address snmp syslog 
!

Last edited by Scrutinizer; 03-15-2014 at 04:39 PM.. Reason: icode to code tags
 

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LEARN ABOUT LINUX

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)
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