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Replace duplicate columns with values from first occurrence

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# 1  
Old 09-03-2012
Replace duplicate columns with values from first occurrence
I've a text file with below values viz. multiple rows with same values in column 3, 4 and 5, which need to be considered as duplicates. For all such cases, the rows from second occurrence onwards should be modified in a way that their values in first two columns are replaced with values as in first occurrence. See the sample input and output copied below

Input file:
Code:
AAA,AAA,1,2,99,981,901,11,14
AAA,AAA,1,2,99,987,907,17,13
AAA,AAA,1,2,99,987,902,12,15
ABC,ABC,1,2,99,983,903,13,16
ABC,ABC,1,2,99,984,904,14,17
ABC,ABC,1,2,99,985,905,15,18
ABC,ABC,1,2,99,986,906,16,19

Output file:
Code:
AAA,AAA,1,2,99,981,901,11,14
AAA,AAA,1,2,99,987,907,17,13
AAA,AAA,1,2,99,987,902,12,15
AAA,AAA,1,2,99,983,903,13,16
AAA,AAA,1,2,99,984,904,14,17
AAA,AAA,1,2,99,985,905,15,18
AAA,AAA,1,2,99,986,906,16,19

Can you help me with a awk command to achieve this?
Last edited by Franklin52; 09-03-2012 at 07:25 AM.. Reason: Please use code tags for data and code samples
# 2  
Old 09-03-2012
Code:
awk -F, '{c[$3,$4,$5]++
if(c[$3,$4,$5]==1)
{
one[$3,$4,$5]=$1
two[$3,$4,$5]=$2
}}
c[$3,$4,$5]>1{$1=one[$3,$4,$5];$2=two[$3,$4,$5]}1' OFS=, file

This User Gave Thanks to elixir_sinari For This Post:
asyed
# 3  
Old 09-03-2012
If the file is sorted on $3, $4, $5 then this could be an alternative:
Code:
awk -F, '{m=$1 FS $2; n=$3 FS $4 FS $5; if(n==p)sub(m,k); else{p=n; k=m}}1' infile

# 4  
Old 09-03-2012
Try:

Code:
awk -F, 'split(k[$3,$4,$5],v){$1=v[1];$2=v[2]} k[$3,$4,$5]=$1FS$2' OFS=, infile

# 5  
Old 09-04-2012
Code:
awk -F"," '{x=$3 FS $4 FS $5}(!a[x]){a[x]++;b[x]=$1;c[x]=$2;print;next}{$1=b[x];$2=c[x];print}' OFS=, filename

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