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Full Discussion: extracting substrings
Top Forums Shell Programming and Scripting extracting substrings Post 302264950 by otheus on Friday 5th of December 2008 07:48:25 AM
Old 12-05-2008
Code:
awk '/^>/ { last=$0; next; } !/^>/ { print last,substr($0,10,30);' }

In the unlikely case that awk reports that it doesn't know about "substr", use "nawk", "mawk", or "gawk".

Also, you said 10 - 40. I'm assuming that means starting at the 10th character and stopping but including the 39th character.
 

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LEARN ABOUT CENTOS

ldns-walk

ldns-walk(1)						      General Commands Manual						      ldns-walk(1)

NAME

       ldns-walk - Retrieve the contents of a DNSSEC signed zone

SYNOPSIS

       ldns-walk [ OPTION ] ZONE

DESCRIPTION

       ldns-walk  is  used  to	retrieve  the  contents  of  a DNSSEC signed zone.  It does this through NSEC-walking (following the chain of NSEC
       records) and 'guessing' the next non-existent owner name for each NSEC.

       Note that it might get stuck on some wildcard records when used through a caching forwarder. This problem can be circumvented  by  querying
       the authoritative nameserver directly (with the @ argument).

       Of course the nameserver that is used must be DNSSEC-aware.

OPTIONS

       -4     Use only IPv4.

       -6     Use only IPv6.

       -f     Do  a  'full'  zone walk; by default, ldns-walk will only show the names, and types present at those names. If this option is given,
	      all resource records will be printed.

       -s name
	      Start the walk with this owner name. Useful when continuing the walk for a large zone.

       -v verbosity
	      Verbosity level [1-5].

       @ nameserver
	      Send the queries to this nameserver.

BUGS

       The full zone walk function is not complete yet, it does not correctly print delegation records

AUTHOR

       Written by Jelte Jansen as an example for ldns usage.

REPORTING BUGS

       Report bugs to <ldns-team@nlnetlabs.nl>.

COPYRIGHT

       Copyright (C) 2005 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A  PARTICULAR  PUR-
       POSE.

								    21 Nov 2005 						      ldns-walk(1)
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