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Full Discussion: Variable IF statement in awk
Top Forums Shell Programming and Scripting Variable IF statement in awk Post 302754177 by meike on Thursday 10th of January 2013 07:29:35 AM
Old 01-10-2013
Variable IF statement in awk
I have multiple requirements to run data extracts (with the same basic requriement / resulsts) however the parameters of the extracts change with each request. To help make life easier I am writing a script where the parameters for the specific request are set at the start and then used as needed.
HOWEVER I am having problems with the awk portion of the script.

To simplify matters here is test data and script to explain the problem.

data file as follows (test)
Code:
1 a
2 b
3 c
4 d

in this instance I want to output record 3 c

script as follows:
Code:
parm='&& ($2=="c")';
cat test | awk -v parm="$parm" '{if ((1==1) parm) {print $0}}'

this is outputting the entire file and not just the 3rd record
(note: the (1==1) is a failsafe incase there is no parameter passed)
Last edited by Franklin52; 01-10-2013 at 08:37 AM.. Reason: Please use code tags for data and code samples
 

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tableau-parm(1) 														   tableau-parm(1)

NAME

       tableau-parm - Tableau Write-blocking Bridge Query/Command Utility

SYNOPSIS

       tableau-parm [-r] device

DESCRIPTION

       tableau-parm  is  designed  to interact with write-blocking forensics bridges produced by Tableau, LLC. It can be used to query bridges for
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OPTIONS

       tableau-parm accepts the following parameters:

       -r     Directs tableau-parm to permanently remove a DCO, if it exists.  THIS WILL MODIFY THE STATE OF THE DRIVE. USE AT YOUR OWN RISK!  (It
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	      if a DCO was detected originally.) Note: after running this, you'll need to restart the Tableau bridge for it  to  correctly  detect
	      the changes.

       device Required	argument.  Specifies  the device file for the bridge/drive to be queried. This must be a device presenting SCSI emulation.
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	      on, one can generally find out what the device was dynamically mapped to by running: dmesg | tail -20

OUTPUT

       tableau-parm  generates	simple output with one data value per line, interspersed with blank lines and section headers.	This output format
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EXAMPLES

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       To remove a DCO from the hard drive on /dev/sda:

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BUGS

       Older versions of ATA and SATA Tableau firmwares didn't properly handle HPA and DCO on some types of drives. Be sure to upgrade your block-
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CREDITS

       Copyright (C) 2007,2009 Timothy D. Morgan

       Copyright (C) 1999,2001,2006,2007 D. Gilbert

       tableau-parm was written by Timothy D. Morgan using portions of SCSI example code written by D. Gilbert.

       Tableau, LLC cooperated in the development of this tool by providing documentation on the proprietary SCSI interfaces and assisted in test-
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LICENSE

       Please see the file "LICENSE" included with this software distribution.

       This  program  is  distributed  in  the	hope  that  it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER-
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SEE ALSO

       hdparm(1) sdparm(1)

Forensics Utilities						 30 September 2009						   tableau-parm(1)
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