How to assign a value to a variable in awk scripting? Post: 303038187

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Top Forums UNIX for Beginners Questions & Answers How to assign a value to a variable in awk scripting? Post 303038187 by bhagya123 on Tuesday 27th of August 2019 02:33:30 PM

08-27-2019

Registered User

Thanks..Actually i tried with substr and it was working..

Later i encountered an error and thought that is related to to the substr function. But looks like it caused by something else.

Thanks for the response !!

--- Post updated at 07:33 PM ---

Similar to that I am also trying an awk array and wanted to check if the array value match string "{5:{" , replace with 5: and assign it back to same array and print it.

But below code is not working its not able to replace the array value , instead its assigning whole command to msg_arr[i] and printing it

any solution for this?

Code:

              for (i=msgtkn_20_lnno; i<msg_lnno;)
              {
                if(msg_arr[i]  ~ /^{5:{/ )
                {
                tag5_before_value= msg_arr[i];
               msg_arr[i]="echo $tag5_before_value | sed 's/{5:{/5:/g'";
                printf "after conversion is %s/n", abc > "LOG.txt";
               print msg_arr[i++];
               }
                else
                {
                  print msg_arr[i++];
                }

              }

as soon as i use "`" its giving me syntax error

Last edited by Don Cragun; 08-27-2019 at 09:49 PM.. Reason: Add CODE tags, again.

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mousex::nativetraits::str

MouseX::NativeTraits::Str(3pm)				User Contributed Perl Documentation			    MouseX::NativeTraits::Str(3pm)

NAME

       MouseX::NativeTraits::Str - Helper trait for Str attributes

SYNOPSIS

	 package MyHomePage;
	 use Mouse;

	 has 'text' => (
	     traits    => ['String'],
	     is        => 'rw',
	     isa       => 'Str',
	     default   => q{},
	     handles   => {
		 add_text     => 'append',
		 replace_text => 'replace',
	     },
	 );

	 my $page = MyHomePage->new();
	 $page->add_text("foo"); # same as $page->text($page->text . "foo");

DESCRIPTION

       This module provides a simple string attribute, to which mutating string operations can be applied more easily (no need to make an lvalue
       attribute metaclass or use temporary variables). Additional methods are provided for completion.

PROVIDED METHODS

       These methods are implemented in MouseX::NativeTraits::MethodProvider::Str. It is important to note that all those methods do in place
       modification of the value stored in the attribute.

       inc Increments the value stored in this slot using the magical string autoincrement operator. Note that Perl doesn't provide analogous
	   behavior in "--", so "dec" is not available.

       append($string)
	   Append a string, like ".=".

       prepend($string)
	   Prepend a string.

       replace($pattern, $replacement)
	   Performs a regexp substitution ("s" in perlop).  A code references will be accepted for the replacement, causing the regexp to be
	   modified with a single "e". "/smxi" can be applied using the "qr" operator.

       replace($pattern, $replacement)
	   Performs a regexp substitution ("s" in perlop) with the "g" flag.  A code references will be accepted for the replacement, causing the
	   regexp to be modified with a single "e". "/smxi" can be applied using the "qr" operator.

       match($pattern)
	   Like "replace" but without the replacement. Provided mostly for completeness.

       chop
	   "chop" in perlfunc

       chomp
	   "chomp" in perlfunc

       clear
	   Sets the string to the empty string (not the value passed to "default").

       length
	   "length" in perlfunc

       substr
	   "substr" in perlfunc. We go to some lengths to match the different functionality based on "substr"'s arity.

METHODS

       meta
       method_provider_class
       helper_type

SEE ALSO

       MouseX::NativeTraits

perl v5.14.2							    2011-12-04					    MouseX::NativeTraits::Str(3pm)

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