Split a file into multiple files based on field value

Shell Programming and Scripting
1

Hi,

I've one requirement. I have to split one comma delimited file into multiple files based on one of the column values.

How can I achieve this Unix

Here is the sample data. In this case I have split the files based on date column(c4)

Input file

c1,c2,c3,c4,c5
123,GL,JE,06-02-2012,500
132,GL,JE,06-02-2012,600
123,GL,JE,06-01-2012,500
153,GL,JE,06-01-2012,600

Desired out put

File 1

c1,c2,c3,c4,c5
123,GL,JE,06-02-2012,500
132,GL,JE,06-02-2012,600

File2

c1,c2,c3,c4,c5
123,GL,JE,06-01-2012,500
153,GL,JE,06-01-2012,600

Thanks

2

Something like this

awk -F, '{print >  "somefile_"$4}' <input_file>