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Get duplicate rows from a csv file

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# 1  
Old 07-27-2017
Get duplicate rows from a csv file
How can i get the duplicates rows from a file using unix, for example i have data like

Code:
a,1
b,2
c,3
d,4
a,1
c,3
e,5

i want output to be like

Code:
a,1
c,3

# 2  
Old 07-27-2017
Try:
Code:
awk '++A[$0]==2' file

This User Gave Thanks to Scrutinizer For This Post:
ggupta
# 3  
Old 07-27-2017
Hi.

Also for the data on file z5:
Code:
$ sort z5 | uniq -d
a,1
c,3

on a system like:
Code:
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.8 (jessie) 
sort (GNU coreutils) 8.23
uniq (GNU coreutils) 8.23

Best wishes ... cheers, drl
# 4  
Old 07-27-2017
@scrutinizer, thanks it really worked, could you please help me with the same case, if i have to find the duplicate rows in a csv if column 2 of csv is not equal, like if

Code:
a,1,2
a,3,2
b,2,4

my output should be like

Code:
a,1,2
a,3,2

because 2nd column do not equal rest are same.
Last edited by Scrutinizer; 07-27-2017 at 01:09 PM.. Reason: code tags
# 5  
Old 07-30-2017
Try something like:
Code:
awk -F, 'NR==FNR {A[$1,$3]++; next} A[$1,$3]>1'  file file

or
Code:
awk -F, 'NR==FNR {A[$1,$3]++; next} A[$1,$3]>1 && !B[$0]++' file file

if there can be multiple occurrences of the same record and they only need to be printed once.


--
Note the input file needs to be specified twice..
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