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Full Discussion: Removing duplicates from a file
Top Forums UNIX for Dummies Questions & Answers Removing duplicates from a file Post 302836269 by Don Cragun on Tuesday 23rd of July 2013 11:59:06 PM
Old 07-24-2013
There are lots of ways to do this. If you want the output sorted by the key you're using to determine duplication, sort -u is the most logical choice. If you want to give preference to the 1st entry found with a given key and have output order match input order, awk provides a simple way to do it:
Code:
awk -F, '!a[$2,$3,$4]++' input1 input2 > mergeNoDup
awk -F, '!a[$2,$3,$4]++' mergeWithDups > mergeNoDup

Use the 1st line if you have your separate files from server 1 and server 2; use the 2nd line if you have already created a merged file and want to remove duplicates from the merged file. Both of these will work with an unlimited number of input files as long as you don't reach ARG_MAX limitations on the number of input files you're feeding into awk.

As always, if you want to try this on a Solaris/SunOS system, use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk rather than /bin/awk or /usr/bin/awk.

Other ways to do this include writing a C (or other high level language program), perl, using the associative arrays that are available in some shells, and an endless number of much less efficient combinations using read (to get a list of keys), grep (to get a count of lines containing a key), and an editor (to remove all but one occurrence of duplicated keys).
 

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LEARN ABOUT DEBIAN

lp-grab-attachments

GRAB-ATTACHMENTS(1)					      General Commands Manual					       GRAB-ATTACHMENTS(1)

NAME

       grab-attachments - downloads attachments from a Launchpad bug

SYNOPSIS

       grab-attachments [options] bug-number...
       grab-attachments -h

DESCRIPTION

       grab-attachments  is  a	script	to  download  all attachments from a Launchpad bug report or bug reports with a source package task into a
       directory named after the bug e.g. bug-1.

OPTIONS

       Listed below are the command line options for grab-attachments:

       bug-number
	      Specifies the Launchpad bug number that the script should download attachments from.

       -h, --help
	      Display a help message and exit.

       -l INSTANCE, --lpinstance=INSTANCE
	      Use the specified instance of Launchpad (e.g. "staging"), instead of the default of "production".

       --no-conf
	      Do not read any configuration files, or configuration from environment variables.

       -d, --duplicates
	      Download attachments from duplicates too.

       -p SRCPACKAGE, --package=SRCPACKAGE
	      Download attachments from all bugs with a task for this source package.

AUTHOR

       lp-grab-attachments was written by Daniel Holbach and this manual page was written by Jonathan Patrick Davies.

       Both are released under the GNU General Public License, version 3.

lptools 							  10 August 2008					       GRAB-ATTACHMENTS(1)
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