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Full Discussion: AWK sub function curious problem under bash
Top Forums UNIX for Advanced & Expert Users AWK sub function curious problem under bash Post 302370479 by Max Rebo on Wednesday 11th of November 2009 02:11:08 PM
Old 11-11-2009
AWK sub function curious problem under bash
I need to detect the number of pages in a print job when it is available so I can warn users when they try to print a report much larger than they expected. Sometimes they are trying to print 1000 page reports when they thought they were getting a 10 page report.

Under linux I am scanning the print job before it goes to the printer and want the user to be able to cancel the print job if it is not what they expected.

This current function works, but is not exactly what I wanted:

Code:
 
function get-last-page() 
{ 
awk '/Page/{ f=$NF }; END{ print f }' $1 | awk '{ sub(/Page/,""); print }'; 
}

In my test case the page numbers can be found on the top of each page after the word "Page". -but- sometimes the page count abuts the "Page" label so the above function could return "Page2308" when there is no white space between the regex "Page" and the desired number. There is no problem when there is white space.

Simple answer, just sub out the /Page/ unconditionally and I always get the last page number of the report. -but- I originally tried it like this (using only one awk call) and I cannot for the life of me make it work properly:

Code:
 
function get-last-page() 
{
awk '/Page/{ f=$NF }; END{ print sub(/Page/,"",f); }' $1; 
}

The above function does not return the desired 2308 (or whatever). I cannot make out what is wrong. If I change it to the following I get what I expect, including the "Page2308":

Code:
 
function get-last-page() 
{
awk '/Page/{ f=$NF }; END{ print f }' $1; 
}

The above behaves as I expect, but has the error I am trying to fix with the second example. I don't understand why I can't do the substitution in the END{} clause but can do it after the pipe (as in the first example).

I really was hoping to get this to work as a sort-of one-liner.

Can anyone help me either fix this or at least understand why it does not work?

I am running under a bash shell on openSuSE 10.3 linux.

TIA
 

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LEARN ABOUT SUNOS

cancel

cancel(1)																 cancel(1)

NAME

       cancel - cancel print request

SYNOPSIS

       cancel [ request-ID...] [destination...]

       cancel -u user... [destination...]

       The cancel utility cancels print requests. There are two forms of the cancel command.

       The first form of cancel has two optional arguments: print requests (request-ID) and destinations (destination). Specifying request-ID with
       destination cancels request-ID on destination. Specifying only the destination cancels the current print request on destination. If  desti-
       nation is not specified, cancel cancels the requested print request on all destinations.

       The second form of cancel cancels a user's print requests on specific destinations.

       Users  can  only  cancel  print	requests associated with their username. By default, users can only cancel print requests on the host from
       which the print request was submitted. If a super-user has set user-equivalence=true in /etc/printers.conf on the print server,	users  can
       cancel  print  requests	associated with their username on any host. Super-users can cancel print requests on the host from which the print
       request was submitted. Superusers can also cancel print requests from the print server.

       The print client commands locate destination information using the printers database in the  name  service  switch.  See  nsswitch.conf(4),
       printers(4), and printers.conf(4) for details.

       The following options are supported:

       -u user	       The name of the user for which print requests are to be cancelled. Specify user as a username.

       The following operands are supported:

       destination     The  destination  on which the print requests are to be canceled. destination is the name of a printer or class of printers
		       (see lpadmin(1M)). If destination is not specified, cancel cancels the requested print request on all destinations. Specify
		       destination  using atomic or POSIX-style (server:destination), names. See  for information regarding using POSIX-style des-
		       tination names with cancel. See standards(5) for information regarding POSIX.

       request-ID      The print request to be canceled. Specify request-ID using LP-style request IDs (destination-number).

       user	       The name of the user for which the print requests are to be cancelled. Specify user as a username.

       The following exit values are returned:

       0	       Successful completion.

       non-zero        An error occurred.

       /var/spool/print/*      LP print queue.

       $HOME/.printers	       User-configurable printer database.

       /etc/printers.conf      System printer configuration database.

       printers.conf.byname    NIS version of /etc/printers.conf.

       printers.org_dir        NIS+ version of /etc/printers.conf.

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWpcu			   |
       +-----------------------------+-----------------------------+

       lp(1), lpq(1B), lpr(1B), lprm(1B), lpstat(1), lpadmin( 1M), nsswitch.conf(4), printers(4), printers.conf(4), attributes(5), standards(5)

       POSIX-style destination names (server:destination) are treated as print requests if destination has the same format as an LP-style request-
       ID. See standards(5).

       Some  print  servers send cancelation notification to job owners when their print jobs have been cancelled. This notification usually comes
       in the form of an email message. Cancelation notices cannot be disabled on a Solaris server.

								    23 Feb 2005 							 cancel(1)
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