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Full Discussion: [awk] find pattern, change next two lines
Top Forums Shell Programming and Scripting [awk] find pattern, change next two lines Post 302897748 by Yoda on Tuesday 15th of April 2014 05:12:42 PM
Old 04-15-2014
Quote:
Originally Posted by origamisven
Thanks a lot, Yoda, can you explain the syntax to me? I don't want to die stupid.
Sure.
Code:
awk '
        # Look for pattern VEL in each record
        /VEL/ {
                # if found set variable c value to 3
                c = 3
        }
        # For each subsequent records decrement variable c value by 1 and check if it is >= 1
        # This condition is to replace next 2 records as you requested
        c-- >= 1 {
                # Substitute SOL with VEL
                sub ( "SOL", "VEL")
        }
        # 1 == true, default awk operation is print the record
        1
' file

This User Gave Thanks to Yoda For This Post:
origamisven
 

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LEARN ABOUT DEBIAN

getds

GETDS(1p)						User Contributed Perl Documentation						 GETDS(1p)

NAME

       getds - Create a DS record from DNSKEYing information

SYNOPSIS

	 getds <domain>

DESCRIPTION

       getds will create a DS record from DNSKEYs for the specified DNS domain.  It does this by converting DNSKEYs to DS records using the
       specified hashing algorithm.  The results can then be passed to upstream DNSSEC-supporting parents or to DLV registries.

       getds will also pull the parent's published DS records and compare them against the existing keys.  It will then list any DS records not
       published in the parent, as well as any DS records that are published in the parent but which don't match an existing key.

OPTIONS

       getds takes the following options:

       -a ALGORITHMS
       --hash-algorithm algorithm ALGORITHMS
	   This option specifies the hash algorithm to use when converting DNSKEYs to DS records.  It may be a comma-separated list if multiple
	   algorithms are desired.  The algorithms to choose from may be either SHA256 or SHA1.

	   The default is SHA256,SHA1

       -z
       --print-zsks
	   This option causes getds to print ZSK DS records, as well as KSK records.

       -p
       --dont-check-parent
	   Instructs getds to not check the records in the parent for their published DS records.

       -q
       --quiet
	   Produces quiet output with no explanatory headers.  In other words, it only prints the DS records generated from the DNSKEYs.

	   Note: Running with -q implies -p.

SECURITY CONSIDERATIONS

       By default, getds pulls data from the live DNS.	If your DNS resolver isn't configured so that this is pulled securely, then the results
       can't be trusted.

COPYRIGHT

       Copyright 2008-2012 SPARTA, Inc.  All rights reserved.  See the COPYING file included with the DNSSEC-Tools package for details.

AUTHOR

       Wes Hardaker, hardaker AT AT AT users.sourceforge.net

perl v5.14.2							    2012-06-21								 GETDS(1p)
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