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Full Discussion: Sed/awk join lines once pattern found
Top Forums UNIX for Beginners Questions & Answers Sed/awk join lines once pattern found Post 302995738 by krsnadasa on Tuesday 11th of April 2017 01:04:45 PM
Old 04-11-2017
Sed/awk join lines once pattern found
Hi all

OS - RHEL6.4

I have input file -f1.txt
Code:
 [=129Dytt.....===..
  
 Sometxt
 \Start\now\fine step
 watch this space for tools 
 ends here 
  
 =--2323UT;;;====.......
  
 \Start\then\go language again
 cubernates space 
 sign in done 
 line again
 do it now

I need to search line which starts with
Code:
\Start

and read next line till it gets blank line and join them all. I need to trim any trailing spaces for each line.So output.txt should be..
Code:
 \Start\now\fine stepwatch this space for toolsends here 
 \Start\then\go language againcubernates spacesign in doneline againdo itnow

I tried ..
Code:
 sed -n '^//Start/{
 s/[ \t]*$// # trim trailing spaces
 N # Move to next line
 s/\n//p #join line and print them

But it goes to next line not beyond. Not sure how to keep lines in buffer till blank line comes.

Tried AWK
Code:
sed -i 's/[ \t]*$//g' f1.txt ; gawk '/^\\Start/{gsub("[\n]","",$0);print $0}RS=""' f1.txt

This gives me only last part
Code:
\Start\then\go language againcubernates spacesign in doneline againdo itnow

Can someone help me out here please?

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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