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Full Discussion: Awk: Remove Duplicates
Top Forums Shell Programming and Scripting Awk: Remove Duplicates Post 302884997 by siramitsharma on Thursday 23rd of January 2014 01:52:46 AM
Old 01-23-2014
Awk: Remove Duplicates
I have the following code for removing duplicate records based on fields in inputfile file & moves the duplicate records in duplicates file(1st Awk) & in 2nd awk i fetch the non duplicate entries in inputfile to tmp file and use move to update the original file.

Requirement:
Can both the awk be combined in single call? or is there any efficient way to do the same?

Code:
awk -F, 'dupentries[$1,$2,$3,$4,$5,$6,$7,$8]++' inputfile >> Duplicates
awk -F, '!dupentries[$1,$2,$3,$4,$5,$6,$7,$8]++' inputfile > inputfile.tmp
mv inputfile.tmp inputfile

 

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LEARN ABOUT CENTOS

hardlink

hardlink(1)						      General Commands Manual						       hardlink(1)

NAME

       hardlink - Consolidate duplicate files via hardlinks

SYNOPSIS

       hardlink [-c] [-n] [-v] [-vv] [-h] directory1 [ directory2 ... ]

DESCRIPTION

       This manual page documents hardlink, a program which consolidates duplicate files in one or more directories using hardlinks.

       hardlink  traverses  one or more directories searching for duplicate files.  When it finds duplicate files, it uses one of them as the mas-
       ter.  It then removes all other duplicates and places a hardlink for each one pointing to the master file.  This allows for conservation of
       disk space where multiple directories on a single filesystem contain many duplicate files.

       Since hard links can only span a single filesystem, hardlink is only useful when all directories specified are on the same filesystem.

OPTIONS

       -c	 Compare  only	the  contents of the files being considered for consolidation.	Disregards permission, ownership and other differ-
		 ences.

       -f	 Force hardlinking across file systems.

       -n	 Do not perform the consolidation; only print what would be changed.

       -v	 Print summary after hardlinking.

       -vv	 Print every hardlinked file and bytes saved. Also print summary after hardlinking.

       -h	 Show help.

AUTHOR

       hardlink was written by Jakub Jelinek <jakub@redhat.com>.

       Man page written by Brian Long.

       Man page updated by Jindrich Novy <jnovy@redhat.com>

BUGS

       hardlink assumes that its target directory trees do not change from under it.  If a directory tree does change, this may result in hardlink
       accessing  files  and/or directories outside of the intended directory tree.  Thus, you must avoid running hardlink on potentially changing
       directory trees, and especially on directory trees under control of another user.

																       hardlink(1)
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