I need to write a PERL script to group and sort the CSV file with below sample data
The sample data from a input file looks like below.

SAMPLE INPUT INPUTFILE.csv
3211111,100,3.2 
3211112,101,3.2 
3211111,100,1.2 
3211112,100,2.2 
3211113,100,5.2 
3211112,100,0.3

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I need to group first two columns and sum up the third column to obtain below output file - 

outputfile.csv 
3211111,100,4.4 
3211112,100,2.5
3211112,101,3.2
3211113,100,5.2

[download]

Please help me out.

2017-07-27 Athanasius added code tags

In reply to perl group by and sort from a csv input file by gowthamvels

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