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Full Discussion: Adding and removing blocks of text from file
Top Forums Shell Programming and Scripting Adding and removing blocks of text from file Post 302889023 by maverick72 on Tuesday 18th of February 2014 10:56:11 AM
Old 02-18-2014
Adding and removing blocks of text from file
Hello all,

short story: I'm writing a script to add and remove dns records in dns files. Its on a RHEL 5.5

So far i've locked up the basic operations in a couple of functions:

- validate the parameters
- search for existant ip in file when adding
- search for existant name records in file when adding
- duplicates
- backup the file
- restart dns service

The problem is the editing part.

Now to help me all the ip's i need to add or remove will be in a block of text

Code:
####Start
ip name_record
ip name_record
ip name_record
####End

right now too add a host i'm using:

Code:
 add_host () {
 sed -i "/####END/i $IP_ADDRESS\t$NAME_RECORD" $CONFIG_FILE
 }

and to remove a host i'm using:

Code:
remove_host () {
sed -i "/^$IP_ADDRESS\t$NAME_RECORD/d" $CONFIG_FILE
}

Looks like it is working but since this is gonna be production i'm just wondering if i'm not forgeting something or if there is something far more simpler, robust or just that editing directly the file is BAD and i should use a simple temp file and move it right after.

I'm just not that confident when dealing with operations between blocks of texts.

I'm also wondering if i should not add logs of operations, mail with the changes,etc

Thanks.
 

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LEARN ABOUT CENTOS

locale::codes::langext

Locale::Codes::LangExt(3)				User Contributed Perl Documentation				 Locale::Codes::LangExt(3)

NAME

       Locale::Codes::LangExt - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangExt;

	  $lext = code2langext('acm');		       # $lext gets 'Mesopotamian Arabic'
	  $code = langext2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langext_codes();
	  @names   = all_langext_names();

DESCRIPTION

       The "Locale::Codes::LangExt" module provides access to standard codes used for identifying language extensions, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language extensions. A code set may be specified using either a name, or
       a constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langext('acm','alpha');
	  $lext = code2langext('acm',LOCALE_LANGEXT_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from the IANA language registry, such as 'acm' for Mesopotamian Arabic.

	   This is the default code set.

ROUTINES

       code2langext ( CODE [,CODESET] )
       langext2code ( NAME [,CODESET] )
       langext_code2code ( CODE ,CODESET ,CODESET2 )
       all_langext_codes ( [CODESET] )
       all_langext_names ( [CODESET] )
       Locale::Codes::LangExt::rename_langext  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangExt::add_langext  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangExt::delete_langext  ( CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangExt::delete_langext_alias  ( NAME )
       Locale::Codes::LangExt::rename_langext_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::delete_langext_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3							    2013-02-27						 Locale::Codes::LangExt(3)
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