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Full Discussion: In ksh script what is this BEGIN and END in this function?
Top Forums Shell Programming and Scripting In ksh script what is this BEGIN and END in this function? Post 302947394 by later_troy on Wednesday 17th of June 2015 04:44:16 PM
Old 06-17-2015
In ksh script what is this BEGIN and END in this function?
Can Someone please explain why BEGIN and END statement is used inside function? How does that help in scripting?

Code:
function fileformatting
{
  CleanupMask="xXxX"

  sed 's/^.//' < ${AllFile} > ${AllFile}.tmp
  echo $(wc -l ${AllFile}.tmp)
       `awk -v CleanupMask=${CleanupMask} '
BEGIN { ; }
{

        inputstr=$0
        Num_Before_Clean_Mask = match(inputstr,CleanupMask)
        Num_After_Clean_Mask = Num_Before_Clean_Mask + 4
        DataString = substr(inputstr, Num_After_Clean_Mask)

        if (Num_Before_Clean_Mask != 0) print DataString

}

END { ; }
' ${AllFile}.tmp > ${AllFile} `

echo $(wc -l ${AllFile})
}

 

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LEARN ABOUT CENTOS

perl::critic::policy::controlstructures::prohibitlabelswithspeci

Perl::Critic::Policy::ControlStructures::ProhibitLabelsWUserpContriPerl::Critic::Policy::ControlStructures::ProhibitLabelsWithSpecialBlockNames(3)

NAME

       Perl::Critic::Policy::ControlStructures::ProhibitLabelsWithSpecialBlockNames - Don't use labels that are the same as the special block
       names.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       When using one of the special Perl blocks "BEGIN", "END", "CHECK", "INIT", and "UNITCHECK", it is easy to mistakenly add a colon to the end
       of the block name.  E.g.:

	   # a BEGIN block that gets executed at compile time.
	   BEGIN { <...code...> }

	   # an ordinary labeled block that gets executed at run time.
	   BEGIN: { <...code...> }

       The labels "BEGIN:", "END:", etc. are probably errors.  This policy prohibits the special Perl block names from being used as labels.

CONFIGURATION

       This Policy is not configurable except for the standard options.

SEE ALSO

       The Perl Buzz article on this issue at <http://perlbuzz.com/2008/05/colons-invalidate-your-begin-and-end-blocks.html>.

ACKNOWLEDGMENT

       Randy Lauen for identifying the problem.

AUTHOR

       Mike O'Regan

COPYRIGHT

       Copyright (c) 2008-2011 Mike O'Regan.  All rights reserved.

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

perl v5.16.3							   Perl::Critic::Policy::ControlStructures::ProhibitLabelsWithSpecialBlockNames(3)
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