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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 OPENDARWIN

ucblinks

ucblinks(1B)					     SunOS/BSD Compatibility Package Commands					      ucblinks(1B)

NAME
       ucblinks - adds /dev entries to give SunOS 4.x compatible names to SunOS 5.x devices

SYNOPSIS
       /usr/ucb/ucblinks [-e rulebase] [-r rootdir]

DESCRIPTION
       ucblinks  creates symbolic links under the /dev directory for devices whose SunOS 5.x names differ from their SunOS 4.x names. Where possi-
       ble, these symbolic links point to the device's SunOS 5.x name rather than to the actual /devices entry.

       ucblinks does not remove unneeded compatibility links; these must be removed by hand.

       ucblinks should be called each time the system is reconfiguration-booted, after any new SunOS 5.x links that are needed have been  created,
       since the reconfiguration may have resulted in more compatibility names being needed.

       In  releases prior to SunOS 5.4, ucblinks used a  nawk rule-base to construct the SunOS 4.x compatible names. ucblinks no longer uses  nawk
       for the default operation, although  nawk rule-bases can still be specifed with the -e option.  The  nawk rule-base equivalent to the SunOS
       5.4 default operation can be found in /usr/ucblib/ucblinks.awk.

OPTIONS
       -e rulebase     Specify rulebase as the file containing nawk(1) pattern-action statements.

       -r rootdir      Specify rootdir as the directory under which dev and devices will be found, rather than the standard root directory /.

FILES
       /usr/ucblib/ucblinks.awk        sample rule-base for compatibility links

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       devlinks(1M), disks(1M), ports(1M), tapes(1M), attributes(5)

SunOS 5.10							    13 Apr 1994 						      ucblinks(1B)
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