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Top Forums UNIX for Dummies Questions & Answers Delete rows with unique value for specific column Post 302655973 by krsnadasa on Thursday 14th of June 2012 05:21:26 AM
Old 06-14-2012
Delete rows with unique value for specific column

Hi Ranga,

Thanks, but still not very clear...I have reformated code for better understanding please explain my comments.
Sorry forgot code tags.

Code:
awk '
BEGIN
{
FS="|";
}
{
a[$3]++;
if(a[$3]==2)
(
print v[$3] ORS $0; # v[$3] --> how it is meaning previous line not current line when we are processing line by line record, ORS= new line is it $0 Currecnt line
)
if(a[$3]>2)
(
print;
)
v[$3]=$0; # is this is assigning current line to v[$3] after every time .
}' file

 

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MODULES.DEP(5)							    modules.dep 						    MODULES.DEP(5)

NAME
modules.dep, modules.dep.bin - Module dependency information SYNOPSIS
/lib/modules/modules.dep /lib/modules/modules.dep.bin DESCRIPTION
modules.dep.bin is a binary file generated by depmod listing the dependencies for every module in the directories under /lib/modules/version. It is used by kmod tools such as modprobe and libkmod. Its text counterpar is located in the same directory with the name modules.dep. The text version is maintained only for easy of reading by humans and is in no way used by any kmod tool. These files are not intended for editing or use by any additional utilities as their format is subject to change in the future. You should use the modinfo(8) command to obtain information about modules in a future proof and compatible fashion rather than touching these files. COPYRIGHT
This manual page originally Copyright 2002, Rusty Russell, IBM Corporation. Maintained by Jon Masters and others. SEE ALSO
depmod(8), modprobe(8) AUTHORS
Jon Masters <jcm@jonmasters.org> Developer Lucas De Marchi <lucas.de.marchi@gmail.com> Developer kmod 01/28/2018 MODULES.DEP(5)
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