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Full Discussion: awk decrement loop
Top Forums Shell Programming and Scripting awk decrement loop Post 302735567 by Don Cragun on Sunday 25th of November 2012 03:46:13 PM
Old 11-25-2012
Note that according to the standards, setting FS to an empty string produces undefined results. (Doing so treats each character as a field in gawk and some other version of awk, but generates various errors or unexpected results on other versions of awk.) If I understand what shivacoder is trying to do, I think the following is a portable way to do what was requested:
Code:
awk -v c=4 '{
        for(i = c; i >= 1; i--) {
                # Print a header preceded by a <newline> if this is not the 1st
                # output line.
                printf("%sProcessing %d character strings from \"%s\".\n",
                        i != c || NR > 1 ? "\n" : "", i, $0)
                if(i > length($0)) {
                        printf("There aren'\''t %d characters in \"%s\".\n",
                                i, $0) 
                        continue
                }
                # Print the 1st line.
                printf("%s%s%s\n", substr($0, 1, i),
                        i == length($0) ? "" : "_", substr($0, i + 1))
                if(length($0) >= i)
                        for(j = 1; j + i < length($0); j++)
                                printf("%s_%s_%s\n", substr($0, 1, j),
                                        substr($0, j + 1, i),
                                        substr($0, j + i + 1))
                # Do not print the last line if it would duplicate the 1st line.
                if(i != length($0) / 2 && length($0) > i)
                        printf("%s_%s\n", substr($0, 1, length($0) - i),
                                substr($0, length($0) - i + 1))
        }
}' input

Last edited by Don Cragun; 11-26-2012 at 01:18 AM..
 

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LEARN ABOUT FREEBSD

mailq

MAILQ(1)						      General Commands Manual							  MAILQ(1)

NAME

       mailq - print the mail queue

SYNOPSIS

       mailq [-Ac] [-q...]  [-v]

DESCRIPTION

       Mailq 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 with a possible status character,
       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 either * to indicate the job is being processed; X to indicate that  the  load	is
       too  high to process the job; and - to indicate that the job is too young to process.  The following lines show message recipients, one per
       line.

       Mailq is identical to ``sendmail -bp''.

       The relevant options are as follows:

       -Ac    Show the mail submission queue specified in /etc/mail/submit.cf instead of the MTA queue specified in /etc/mail/sendmail.cf.

       -qL    Show the "lost" items in the mail queue instead of the normal queue items.

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

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

       -q[!]Q substr
	      Limit processed jobs to quarantined jobs containing substr as a substring of the quarantine reason or not when !	is specified.

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

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

       -v     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.  Additionally, extra lines may be intermixed with the
	      recipients indicating 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 expanded from, if any.  Moreover, status messages for each recipient are printed if
	      available.

       Several sendmail.cf options influence the behavior of the mailq utility: The number of items printed  per  queue  group	is  restricted	by
       MaxQueueRunSize	if  that  value  is set.  The status character * is not printed for some values of QueueSortOrder, e.g., filename, random,
       modification, and none, unless a -q option is used to limit the processed jobs.

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

SEE ALSO

       sendmail(8)

HISTORY

       The mailq command appeared in 4.0BSD.

							   $Date: 2013-11-22 20:51:55 $ 						  MAILQ(1)
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