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Full Discussion: I can't seem to pass variables properly into a nawk statement
Top Forums Shell Programming and Scripting I can't seem to pass variables properly into a nawk statement Post 302180144 by DeCoTwc on Sunday 30th of March 2008 05:15:49 AM
Old 03-30-2008
I can't seem to pass variables properly into a nawk statement
Ok, So up front I'm going to say that I'm a very elementary scripter, and I tend to use tools I don't fully understand, but I shotgun at something until I can get it to work...that said, I can't for the life of me understand why I can't get this to go down the way I want it to.

The goal:
-to establish todays date
-to take a look at a log file (in this case the /var/adm/messages log)
-to check if the last line of the log matches todays date and if so ... (eventually it will be to dump all lines of the log with todays date to a text file that will at some point be picked up by the notification server and go out in an email)

My issue is that though I can establish the date, and create variables based upon it, I can't get nawk to accept the variables I've created.

What I have so far:

Code:
#!/usr/bin/bash
#collect todays date (date)
d=`date|awk '{print $3}'`
#collect todays date (month)
m=`date|awk '{print $2}'`
#collect errors for todays date (day and month)
e=`grep ""$d" "$m"" /var/adm/messages`
tail -1 /var/adm/messages|nawk -v m=$m -v d=$d  '{if ($1 == "$m" && $2 == "$d") print "success"}'
#if 
#        [ "$z" = "success" ]; 
#then echo "$e"
#fi

this returns nothing, no errors, just goes straight back to the prompt.

Now as a matter of checking my work I've tried replacing that last nawk statement with
Code:
tail -1 /var/adm/messages|nawk -v m=$m  '{print $m}'

I figured this would at least tell me if my variable is making it into the nawk statement, but this returns:

"nawk: illegal field $(Mar)
input record number 1
source line number 1"

the last thing that I've tried, just to make sure my syntax isn't completely foobar was
Code:
tail -1 /var/adm/messages|nawk -v m=$m -v d=$d  '{if ($1 == "Mar" && $2 == "30") print "success"}'

and that returns success...

So from what I can gather, my overall nawk statement is good, it's just not using the variables from the rest of the script.

So any input would be appreciated. Also (although, I want to learn this way) if anyone has any insight on a better method of keeping track of the messages log (or any log) please chime in.
 

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LEARN ABOUT OPENSOLARIS

sulog

sulog(4)							   File Formats 							  sulog(4)

NAME

       sulog - su command log file

SYNOPSIS

       /var/adm/sulog

DESCRIPTION

       The  sulog file is a record of all attempts by users on the system  to execute the su(1M) command.  Each time  su(1M) is executed, an entry
       is added to the sulog file.

       Each entry in the sulog file is a single line of the form:

	 SU date time
	 result port user-newuser

       where

       date	  The month and date su(1M) was executed.  date is displayed in the form mm/dd where  mm is the month number and  dd  is  the  day
		  number in the month.

       time	  The time  su(1M) was executed. time is displayed in the form	HH/MM where  HH is the hour number (24 hour system) and  MM is the
		  minute number.

       result	  The result of the  su(1M) command.  A ` + ' sign is displayed in this field if the su attempt was successful; otherwise  a ` - '
		  sign is displayed.

       port	  The name of the terminal device from which  su(1M) was executed.

       user	  The user id of the user executing the  su(1M) command.

       newuser	  The user id being switched to with  su(1M).

EXAMPLES

       Example 1 A sample sulog file.

       Here is a sample sulog file:

	 SU 02/25 09:29 + console root-sys
	 SU 02/25 09:32 + pts/3 user1-root
	 SU 03/02 08:03 + pts/5 user1-root
	 SU 03/03 08:19 + pts/5 user1-root
	 SU 03/09 14:24 - pts/5 guest3-root
	 SU 03/09 14:24 - pts/5 guest3-root
	 SU 03/14 08:31 + pts/4 user1-root

FILES

       /var/adm/sulog	  su log file

       /etc/default/su	  contains the default location of  sulog

SEE ALSO

       su(1M)

SunOS 5.11							    6 Jun 1994								  sulog(4)
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