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Full Discussion: Printing a specific line using AWK
Top Forums Shell Programming and Scripting Printing a specific line using AWK Post 302215880 by jake_won on Thursday 17th of July 2008 11:19:26 AM
Old 07-17-2008
Printing a specific line using AWK
Hi,

I have a script that fetches only specific information from fcinfo command. Below is a portion of the script.

#!/usr/bin/ksh
set -x
HBA_COUNT=`sudo fcinfo hba-port | grep -i state | awk 'END{print NR}'`
echo "$HBA_COUNT HBAs exist"
echo '........'

INDEX=1
while [wiki] $INDEX -le $HBA_COUNT [/wiki] ; do
HBA_STAT[$INDEX]=`sudo fcinfo hba-port | grep -i 'Port WWN' | awk 'NR==$INDEX' | awk '{print $NF}'`
print 'WWN:'
print ${HBA_STAT[$INDEX]}
(( INDEX=$INDEX+1 ))
done

The part in red is where I'm having trouble with. When I type
sudo fcinfo hba-port | grep -i 'Port WWN' | awk 'NR==1' | awk '{print $NF}'
into the command line, I have no problem displaying the WWN info (where the value in blue can vary).

Also, I noticed something funny where if i replace (in the script)
HBA_STAT[$INDEX]=`sudo fcinfo hba-port | grep -i 'Port WWN' | awk 'NR==$INDEX' | awk '{print $NF}'`
with
HBA_STAT[$INDEX]=`sudo fcinfo hba-port | grep -i 'state' | awk 'NR==$INDEX' | awk '{print $NF}'`
it still doesn't work, but once I change 'NR==$INDEX' with '$NR==INDEX', it works...
Can someone explain why this is happening and maybe correct me on the syntax if I'm doing something wrong?

Thanks
This User Gave Thanks to jake_won For This Post:
Ananthdoss
 

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LEARN ABOUT OPENSOLARIS

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

ATTRIBUTES

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

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWgawk	      |
       +--------------------+-----------------+
       |Interface Stability | Volatile	      |
       +--------------------+-----------------+
NOTES

       Source for gawk is available on http://opensolaris.org.

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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