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Full Discussion: awk script: need help
Top Forums Shell Programming and Scripting awk script: need help Post 302977341 by bhupeshchavan on Saturday 16th of July 2016 06:53:35 AM
Old 07-16-2016
Hi Don,

Thank you very much for the explanation.

I got it , just for my understanding(like setting up values first and then evaluating it) i tried the below code and the output is fine, please check if this is the correct way to write or i should follow the RudiC's process of writing it.
Code:
awk '
/^time/ {HR = substr ($0, 6, 2)
        }
/eof/   {if (HR <= 12)   print TMP
         TMP = DL = ""
         next
        }
        {TMP = TMP DL $0
         DL  = ","
        }
' log

I believe that TMP keeps on adding the content to the TMP for the other lines until it finds eof. But when we use "TMP = TMP DL $0 DL=","", this is what i am still not sure about.
TMP=TMP means all the values till eof then why should we use DL and $0 after that .What does it mean to TMP.

Can we just TMP=TMP and set OFS="," at the beginning.I tried the below code but no output.
Code:
awk '
 BEGIN{OFS=","}
 /eof/   {if (HR <= 12)   print TMP
          TMP =""
          next
         }
         {TMP = TMP
         }
 /^time/ {HR = substr ($0, 6, 2)
         }
 ' log

Please help.

Thank you.
 

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LEARN ABOUT HPUX

mailq

mailq(1)						      General Commands Manual							  mailq(1)

NAME

       mailq - prints the mail queue

SYNOPSIS

DESCRIPTION

       prints a summary of the mail messages queued for future delivery.

       The  first line printed for each message shows the internal identifier used on this host for the message, the size of the message in bytes,
       the date and time the message was accepted into the queue, and the envelope sender of the message.  The second line shows the error message
       that  caused  this  message  to be retained in the queue; it will not be present if the message is being processed for the first time.  The
       status characters are:

	      to indicate that the job is being processed

	      to indicate that the load is too high to process the job

	      to indicate that the job is too new in the queue to process.

       The output lines that follow the second line show the message recipients, one per line.

       is identical to

   Options
       The supported options are:

       Show the mail submission queue specified in the
		       file instead of the MTA queue specified in the file.

       Show the lost items in the mail queue instead of normal queue items.

       Show the quarantined items in the mail queue instead
		       of the normal queue items.

       Limit processed jobs to those containing
		       substr as a substring of the queue ID or not when is specified.

       Limit processed jobs to quarantined jobs containing
		       substr as a substring of the quarantine reason or not when is specified.

       Limit processed jobs to those containing
		       substr as a substring of one of the recipients or not when is specified.

       Limit processed jobs to those containing
		       substr as a substring of the sender or not when is specified.

       Print verbose information.
		       This adds the priority of the message and a single character indicator or blank) indicating whether a warning  message  has
		       been  sent on the first line of the message.  In addition, extra lines may be intermixed with the recipients indicating the
		       `controlling user' information.	This shows who owns the programs that are executed on behalf of this message and the  name
		       of the alias this command expanded from, if any.

RETURN VALUE

       The utility exits with 0 on success, and >0 if an error occurs.

AUTHOR

       was developed by the University of California, Berkeley, and originally appeared in 4.0BSD.

FILES

       mail queue files for

SEE ALSO

       sendmail(1M).

																	  mailq(1)
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