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Full Discussion: Command to extract empty field in a large UNIX file?
Top Forums UNIX for Beginners Questions & Answers Command to extract empty field in a large UNIX file? Post 303032875 by rakeshp on Monday 25th of March 2019 05:34:46 PM
Old 03-25-2019
Command to extract empty field in a large UNIX file?
Hi All,

I have records in unix file like below. In this file, we have empty fields from 4th Column to 22nd Column. I have some 200000 records in a file. I want to extract records only which have empty fields from 4th field to 22nd filed. This file is comma separated file. what is the unix command we can use for this? Please let me know

Code:
x,999999,429,,,,,,,,,,,,,,,,,,,,9999999,999999,xxxxxxxx,,xxxxxxxx,,xxxxxx,xx,xxxxxx,xxxxxxxxxxxxxxxxxxxx,
y,888888,429,,,,,,,,,,,,,,,,,,,,8888888,,xxxxxxxx xxxxxxxx,,xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx,,xxxxxxxx,xxxxxxxx,xxxxxxxx,,,,,
z,777777,429,,,,,,,,,,,,,,,,,,,,6666666,xxxxxxxx,xxxxxxxx xxxxxxxx,,xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx,,xxxxxxxx,xxxxxxxx,xxxxxxxx
A,666666,429,,,,,,,,,,,,,,,,,,,,4444444,,xxxxxxxx xxxxxxxx,,xxxxxxxx xxxxxxxx,,xxxxxxxx,xxxxxxxx,xxxxxxxx,,,,,xxxxxxxx 
B,555555,429,,,,,,,,,,,,,,,,,,,,3333333,,xxxxxxxx xxxxxxxx,,xxxxxxxx xxxxxxxx xxxxxxxx,,xxxxxxxx,
C,444444,429,,,,,,,,,,,,,,,,,,,,2222222,,xxxxxxxx xxxxxxxx,,xxxxxxxx xxxxxxxx xxxxxxxx,,xxxxxxxx xxxxxxxx,
D,333333,429,,,,,,,,,,,,,,,,,,,,5555555,,xxxxxxxx xxxxxxxx,,xxxxxxxx xxxxxxxx xxxxxxxx

Thanks
Rakesh
 

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LEARN ABOUT DEBIAN

ift-extract

I2M19058(1)							     GNU Info							       I2M19058(1)

NAME

       ift-extract.info - ift-extract.info

Built-in iSight firmware extractor and patcher
       ift-extract extract the Built-in iSight firmware from Apple driver and patch it to avoid some bugs in it. The firmware is then ready to get
       loaded into the chip using ift-load.

       * Menu:

       Finding the Apple driver: see "Driver"

       Command line options: see "Options"

       See also "Copying"

   1 Finding the Apple driver
       ift-extract extract Built-in iSight firmware from Apple iSight driver.  This driver is located at
       /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBVideoSupport.kext/Contents/MacOS/AppleUSBVideoSupport on your Mac OS X
       root partition.

       There is several version of this driver depending on driver version or host architecture (PowerPC or x86). Thus, ift-extract must determine
       know the variant of the driver in order to properly extract the firmware.

       Any AppleUSBVideoSupport file starting with those shipped with iMac G5 iSight must work. If not, please report unknown AppleUSBVideoSupport
       at bugreport mail address with machine type and OS X version.

   2 Command line options
       `-a' `--apple-driver' Apple driver filename where to extract the firmware.

       `-d' `--output-directory' The directory where to output the firmware. Defaults to /lib/firmware.

       `-f' `--output-filename' The output firmware name. Defaults to isight.fw

       `-?'  `--help' Shows option help and quit.

       Since ift-extract defaults to output the firmware to /lib/firmware/isight.fw, ensure you have the right to do so.

   3 Copying
       isight-firmware-tools is a project developped by A~Xtienne Bersac based on the work of Ronald S. Bultje, Johannes Berg and Ivan N. Zlatev.

       This manual has been written by A~Xtienne Bersac.

       Copyright (C) 2007 A~Xtienne Bersac <bersace@gmail.com>

perl v5.14.2							    2012-01-09							       I2M19058(1)
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