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In ksh script what is this BEGIN and END in this function?

 
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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 LINUX

suspend

suspend(1)                                                         User Commands                                                        suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                         suspend(1)