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Full Discussion: Scripting Issue with Variables from awk
Top Forums Shell Programming and Scripting Scripting Issue with Variables from awk Post 302818885 by sjrupp on Sunday 9th of June 2013 06:40:06 PM
Old 06-09-2013
Scripting Issue with Variables from awk
Greetings all,

Disclaimer: I'm a novice and always welcome best practices as I'm learning.

File example:
Code:
100,1.1.1.1,1.1.1.2,10.10.10.1,172.16.1.10,172.16.1.20
101,1.1.2.1,1.1.2.2,10.10.20.1,172.16.2.10,172.16.2.20
102,1.1.3.1,1.1.3.2,10.10.30.1,172.16.3.10,172.16.3.20
...and so on

I'm trying to write a loop that will use awk to generate variables from the lines above by pattern matching.

After Googling examples and searching forums, I thought I could use the following:

Code:
#!/bin/bash
i=100

while [ $i -le 102 ] #limited run for testing, ultimately about 600
do

v1=`cat sites.txt | awk -v va=$i ' /^va/ ' | cut -d, -f2`
v2=`cat sites.txt | awk -v va=$i ' /^va/ ' | cut -d, -f3`
v3=`cat sites.txt | awk -v va=$i ' /^va/ ' | cut -d, -f4`
v4=`cat sites.txt | awk -v va=$i ' /^va/ ' | cut -d, -f5`
v5=`cat sites.txt | awk -v va=$i ' /^va/ ' | cut -d, -f6`

echo $i > $i.php
echo $v1 >> $1.php
echo $v2 >> $1.php
echo $v3 >> $1.php
echo $v4 >> $1.php
echo $v5 >> $1.php

(( i++ ))

done

I know stepping out of a script isn't a the best practice, but this is a quick and dirty script just to quickly kick out some flat files.

The variables I'm trying to create do not generate output. I know the $i variable is there.

Output (summary):
Code:
++ cat sites.txt
++ awk -v va=101 ' /^va/ '
++ cut -d, -f2
+ v1=

Would anyone mind giving me a hint to what is going awry? I don't expect anyone to rewrite all the code and make it beautiful, just trying to figure out how I can work through problems like this by myself in the future.

Thanks,
Stephen
Last edited by Scrutinizer; 06-10-2013 at 01:05 AM.. Reason: more code tags
 

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LEARN ABOUT SUNOS

gnomevfs-cat

gnomevfs-cat(1) 						   User Commands						   gnomevfs-cat(1)

NAME

       gnomevfs-cat - print a file to standard output using the VFS system

SYNOPSIS

       gnomevfs-cat URI

DESCRIPTION

       gnomevfs-cat prints a file to standard output using the virtual file system to access the file via a URI.

OPERANDS

       The following operands are supported:

       URI	       Specifies the file location in standard URI format.

EXAMPLES

       Example 1: Cat a File From a Web Server

       example% gnomevfs-cat http://www.sun.com

       Example 2: Cat a Local File

       example% gnomevfs-cat file:///home/user/README.txt

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables: NLSPATH.

EXIT STATUS

       The exit value 0 is returned regardless of success or failure.

FILES

       The following files are used by this application:

       /usr/bin/gnomevfs-cat   Executable to print a file to standard output using the VFS system

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-vfs		   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |External			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gnomevfs-copy(1), gnomevfs-info(1), gnomevfs-ls(1), gnomevfs-mkdir(1)

NOTES

       Written by Stephen Browne, Sun Microsystems Inc., 2004.

SunOS 5.10							    6 Sep 2004							   gnomevfs-cat(1)
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