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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 OPENSOLARIS

mailq

mailq(1)							   User Commands							  mailq(1)

NAME

       mailq - print the mail queue

SYNOPSIS

       /usr/bin/mailq [-Ac] [-q subarg] [-v]

DESCRIPTION

       The mailq utility displays a summary of the mail messages queued for future delivery.

       The  first line displayed for each mail 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  of  the  display
       shows  the error message that caused this message to be retained in the queue. This line will not be displayed if the message is being pro-
       cessed for the first time.

       The mailq utility used to be identical to sendmail -bp. Now it checks for the authorization attribute, solaris.mail.mailq. If the check for
       the  invoking  user  succeeds,  sendmail  -bp  is executed with the remaining argument vector. Otherwise, an error message is printed. This
       authorization attribute is by default enabled for all users. It can be disabled by modifying the Basic Solaris User entry in prof_attr(4).

OPTIONS

       The following options are supported:

       -Ac		Like sendmail(1M), this flag tells mailq to use submit.cf rather than sendmail.cf even	if   the   operation   mode   does
			not  indicate  an  initial  mail  submission. This will result in the client queue /var/spool/clientmqueue being displayed
			rather than the default server queue /var/spool/mqueue.

       -qp[time]	Similar to -qtime, except that instead of periodically forking a child to process the queue, sendmail forks a single  per-
			sistent  child	for  each  queue that alternates between processing the queue and sleeping. The sleep time is given as the
			argument. The sleep time default is 1 second. The process will always sleep at least 5 seconds if the queue was  empty	in
			the previous queue run.

       -qf		Processes saved  messages in the queue once and does not fork(), but runs in the foreground.

       -qG name 	Processes jobs in the queue group called name only.

       -q[!]I substr	Limits processed jobs to those containing substr as a substring of the queue id, or not when ! is specified.

       -q[!]R substr	Limits processed jobs to those containing substr as a substring of one of the recipients, or not when ! is specified.

       -q[!]S substr	Limits processed jobs to those containing substr as a substring of the sender, or not when ! is specified.

       -v		Prints 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. Additionally, extra lines may be intermixed with
			the recipients that indicate the "controlling user" information. This shows who will own any programs that are executed on
			behalf of this message and the name of the alias this command is expanded from, if any.

EXIT STATUS

       0      Successful completion.

       >0     An error occurred.

FILES

       /etc/security/prof_attr	  local source for execution profile attributes

       /var/spool/mqueue	  default server queue

       /var/spool/clientmqueue	  client queue

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsndmu 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sendmail(1M), prof_attr(4), attributes(5)

SunOS 5.11							    10 Jul 2002 							  mailq(1)
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