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Full Discussion: Awk: passing shell variables through and extracting text
Top Forums Shell Programming and Scripting Awk: passing shell variables through and extracting text Post 303013314 by bedtime on Monday 19th of February 2018 01:52:13 PM
Old 02-19-2018
Quote:
Originally Posted by rdrtx1
Code:
textA="Here is a"
textB="very nice string."

echo "Here is a blah ... blah ... blah very nice string." | awk  -v var1="$textA" -v var2="$textB" '{sub(var2, ""); sub(var1, ""); print}'

Thank you for such a timely response! Smilie

I don't think I was clear in my question: I wanted just the text in between the two phrases and that alone—nothing except that. If there is no match of the two phrases in one field then I want nothing to be returned, so if there is additional text before and after textA and/or textB, that text should not be there.


Okay, let me just give you guys the code I'm using and not dilly dally:

Working code to extract the local weather in my city.
Code:
#!/bin/bash

wget -q -O- "hamiltonweather.ca/traffic/" | awk -F '<h2>' '{sub(/ •/, ""); print $2}' RS='</h2>' | grep -o '[^,]*$'

Returns:
Code:
Light Rain 4.3°C

The code works beautifully as is (I added some of your code in there rdrtx to get rid of a dot! Smilie Grep clears a blank line at the end) when hard-coded, but as soon as I add the above variables it doesn't work as intended:

Unworking Code with variables added:
Code:
#!/bin/bash

textBefore='<h2>'
textAfter='</h2>'

wget -q -O- "hamiltonweather.ca/traffic/" | awk -v var1="$textBefore" -v var2="$textAfter" -F var1 '{sub(/ •/, ""); print $2}' RS=var2 | grep -o '[^,]*$'

Returns nothing at all. How to make the awk understand and use the variables as in the working code?
Last edited by Don Cragun; 02-19-2018 at 03:20 PM.. Reason: Fix tags again. QUOTE->CODE, ICODE->CODE, add ICODE.
 

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LEARN ABOUT OSX

locale::codes::langfam

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

NAME

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

SYNOPSIS

	  use Locale::Codes::LangFam;

	  $lext = code2langfam('apa');		       # $lext gets 'Apache languages'
	  $code = langfam2code('Apache languages');    # $code gets 'apa'

	  @codes   = all_langfam_codes();
	  @names   = all_langfam_names();

DESCRIPTION

       The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in
       ISO 639-5.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5
       language family codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language families. 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 = code2langfam('apa','alpha');
	  $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages.

	   This is the default code set.

ROUTINES

       code2langfam ( CODE [,CODESET] )
       langfam2code ( NAME [,CODESET] )
       langfam_code2code ( CODE ,CODESET ,CODESET2 )
       all_langfam_codes ( [CODESET] )
       all_langfam_names ( [CODESET] )
       Locale::Codes::LangFam::rename_langfam  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangFam::add_langfam  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangFam::delete_langfam  ( CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangFam::delete_langfam_alias  ( NAME )
       Locale::Codes::LangFam::rename_langfam_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::delete_langfam_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.loc.gov/standards/iso639-5/id.php
	   ISO 639-5 .

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::LangFam(3pm)
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