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Full Discussion: "sed -n expression " fails. Why?
Top Forums Shell Programming and Scripting "sed -n expression " fails. Why? Post 92715 by grahamb on Wednesday 14th of December 2005 07:23:02 AM
Old 12-14-2005
"sed -n expression " fails. Why?
Hi Everyone!

I am trying to extract records between date makers in a log file. My selection string doesn't work, though. Please help.

This test works, if I manually enter the two date-strings (output=28 lines):
Code:
# sed -n '/\[20051213\]/,/\[20051214\]/p' ./access_log

But if the date string is a variable, it will not work:
eg1 (output=ZERO lines):
Code:
# DF="20051213"; DT="20051214"; export DF DT
# sed -n '/\[`echo ${DF}`\]/,/\[`echo ${DT}`\]/p' ./access_log

eg2, using --file= (output= sed error message):
Code:
# DF="20051213"; DT="20051214"; export DF DT
# echo "'/\[${DF}\]/,/\[${DT}\]/'" > /tmp/sed_file
# cat /tmp/sed_file
# '/\[20051213\]/,/\[20051214\]/'  ## note: contents of /tmp/sed_file
# sed -n --file=/tmp/sed_file ./tangofreaks_access_log
# sed: file /tmp/sed_file line 1: Unknown command: `''

What is going wrong??? Smilie ???
Please help! Thanks Smilie
GrahamB
Last edited by grahamb; 12-14-2005 at 08:31 AM.. Reason: Clearer view of "CODE"
 

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LEARN ABOUT OSX

locale::codes::langext

Locale::Codes::LangExt(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangExt(3pm)

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) 2011-2012 Sullivan Beck

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

perl v5.16.2							    2012-10-11					       Locale::Codes::LangExt(3pm)
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