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Full Discussion: Ignore records with no values through awk
Top Forums Shell Programming and Scripting Ignore records with no values through awk Post 302495063 by singh.chandan18 on Wednesday 9th of February 2011 09:07:12 AM
Old 02-09-2011
Hi,

I am not pretty sure about awk 'NF-1'. But the second one (awk '$2' infile) means, it will only show the records which have 2 or more fields, pupulated with strings. If you give awk '$4' infile, it will only output the records those have 4 or more fields. Please see below.

Code:
$ awk '$2' EMS_Status.txt
auktltar.dc-dublin.de:5922 ICCIR2Test09-CB-01 active
auktltbr.dc-dublin.de:6922 ICCIR2Test09-RB-01 active
auktltar.dc-dublin.de:7922 ICCIR2Test09-SB-01 active
auktltar.dc-dublin.de:5522 ICCIR2Test06-CB-01 active Server:
auktltar.dc-dublin.de:7622 ICCIR2Test06-SB-01 active

Code:
$ awk '$4' EMS_Status.txt
auktltar.dc-dublin.de:5522 ICCIR2Test06-CB-01 active Server:

---------- Post updated at 07:37 PM ---------- Previous update was at 07:33 PM ----------

Hi Scrutinizer.

Could you please explain the meaning of awk NF-1.

Thank You,
Chandan
 

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LEARN ABOUT DEBIAN

vconsole.conf

VCONSOLE.CONF(5)						   vconsole.conf						  VCONSOLE.CONF(5)

NAME

       vconsole.conf - configuration file for the virtual console

SYNOPSIS

       /etc/vconsole.conf

DESCRIPTION

       The /etc/vconsole.conf file configures the virtual console, i.e. keyboard mapping and console font.

       The basic file format of the vconsole.conf is a newline-separated list environment-like shell-compatible variable assignments. It is
       possible to source the configuration from shell scripts, however, beyond mere variable assignments no shell features are supported,
       allowing applications to read the file without implementing a shell compatible execution engine.

       Note that the kernel command line options vconsole.keymap=, vconsole.keymap.toggle=, vconsole.font=, vconsole.font.map=,
       vconsole.font.unimap= may be used to override the console settings at boot.

       Depending on the operating system other configuration files might be checked for configuration of the virtual console as well, however only
       as fallback.

OPTIONS

       The following options are understood:

       KEYMAP=, KEYMAP_TOGGLE=
	   Configures the key mapping table of for they keyboard.  KEYMAP= defaults to us if not set. The KEYMAP_TOGGLE= can be used to configured
	   a second toggle keymap and is by default unset.

       FONT=, FONT_MAP=, FONT_UNIMAP=
	   Configures the console font, the console map and the unicode font map.  FONT= defaults to latarcyrheb-sun16.

EXAMPLE

       Example 1. German keyboard and console

       /etc/vconsole.conf:

	   KEYMAP=de-latin1
	   FONT=latarcyrheb-sun16

SEE ALSO

       systemd(1), loadkeys(1), setfont(8), locale.conf(5)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd 							    10/07/2013							  VCONSOLE.CONF(5)
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