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Top Forums Shell Programming and Scripting awk - use fields from subsequent lines Post 302576710 by colinjohnson on Friday 25th of November 2011 07:13:44 PM
Old 11-25-2011
awk - use fields from subsequent lines

I've run into a problem getting exactly what I want out of awk - some folks may recognize this as an output from Amazon's ec2-describe-instances:

Given the following:
INSTANCE i-4960f321
BLOCKDEVICE Line2Var2
TAG instance i-4960f321 Name web1
TAG instance i-4960f321 aws:autoscaling:groupName web1asg
INSTANCE i-4960f322
BLOCKDEVICE Line6Var2
TAG instance i-4960f322 Name web2
TAG instance i-4960f322 aws:autoscaling:groupName web2asg
INSTANCE i-4960f320
BLOCKDEVICE Line10Var2
TAG instance i-4960f320 Name app1

The desired output is:
$2 (from the INSTANCE line), $5 (from the first TAG line) or NULL, $5 (from the second TAG line) or NULL.

Example:
i-4960f321 web1 web1asg
i-4960f322 web2 web2asg
i-4960f320 app1 NULL

CJ

P.S. If folks are interested, if I find something helpful here I'm planning on using for a suite of Amazon Web Service related tools called aws missing tools (Google for it - fourth link).
 

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DOVEADM-INSTANCE(1)						      Dovecot						       DOVEADM-INSTANCE(1)

NAME
doveadm-instance - Manage the list of running Dovecot instances SYNOPSIS
doveadm [-Dv] [-f formatter] instance list doveadm [-Dv] instance remove name | base_dir DESCRIPTION
The doveadm instance commands are used to manage the list of Dovecot instances running on the server. In most installations there is only one Dovecot instance, but in some cases is may be useful to have more (e.g. running director proxy and backend in the same server). Instances are added to the list automatically when Dovecot is started. Each instance is uniquely identified by its base_dir setting. Instances can be named by setting instance_name in each instance's dovecot.conf. When an instance is named, it can be accessed easily by giving -i instance_name command line parameter for Dovecot binaries (e.g. doveadm). OPTIONS
Global doveadm(1) options: -D Enables verbosity and debug messages. -f formatter Specifies the formatter for formatting the output. Supported formatters are: flow prints each line with key=value pairs. pager prints each key: value pair on its own line and separates records with form feed character (^L). tab prints a table header followed by tab separated value lines. table prints a table header followed by adjusted value lines. -v Enables verbosity, including progress counter. ARGUMENTS
name The value of an instance's instance_name setting. base_dir The base directory of a Dovecot instance. COMMANDS
instance list doveadm instance list This command lists the seen Dovecot instances. instance remove doveadm instance remove name | base_dir This command removes the specified instance. REPORTING BUGS
Report bugs, including doveconf -n output, to the Dovecot Mailing List <dovecot@dovecot.org>. Information about reporting bugs is avail- able at: http://dovecot.org/bugreport.html SEE ALSO
doveadm(1) Dovecot v2.1 2012-02-16 DOVEADM-INSTANCE(1)
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