Shell Programming and Scripting

#!/usr/bin/env python
import csv
filename = "file"
reader = csv.reader(open(filename),delimiter=",")
for row in reader: 
    for n,item in enumerate(row):
        row[n]=row[n].replace(",","")
    print ','.join(row)

# more file
rohan,rahul,kunal,"sw,ati"
rohan,rahul,"kun,al",swati
rohan,"rah,ul",kunal,swati
"ro,han",rahul,kunal,swati

# ./test.py
rohan,rahul,kunal,swati
rohan,rahul,kunal,swati
rohan,rahul,kunal,swati
rohan,rahul,kunal,swati

sed 's/\(.*\),\(.*\)/\1\2/g'  file.txt

while(<DATA>){
	s/,(?=[^,"]+")//;
	s/"//g;
	print;
}
__DATA__
rohan,rahul,kunal,"sw,ati"
rohan,rahul,"kun,al",swati
rohan,"rahul",kunal,"sw,ati"
"ro,han",rahul,kunal,swati

 
use strict;
use warnings;
while(<DATA>) {
        s/\"(.*?)\,(.*?)\"/$1.$2/ge;
        print;
}
__END__
"ro,han",rahul,kunal,"sw,ati"
rohan,"r,ahul","kun,al",swati
rohan,"rah,ul",kunal,swati
"ro,han",rahul,kunal,"s,wati"