Edit .csv file, first column not quoted

Question

I exported a.csv file that contains mistakes. I have never edited such files, therefore I have no idea how to do it. I've looked up on internet and found nothing of the sort.

Since I'm on mac, I have to used text editor apparently.

I'll show the.csv in the snippet:

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-78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-06","2022","04","06","","11,3","","-1,6","","4,9","","13,1","","0,0","","","M","","M","","M","","","8","","49","" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-07","2022","04","07","","8,3","","1,2","","4,8","","13,2","","0,0","","","M","","M","","M","","","10","","59","" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-08","2022","04","08","","8,1","","-1,3","","3,4","","14,6","","0,0","","","M","","M","","M","","","","M","","M" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-09","2022","04","09","","1,5","","-3,4","","-1,0","","19,0","","0,0","","","M","","M","","M","","","","M","","M" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-10","2022","04","10","","3,8","","-5,0","","-0,6","","18,6","","0,0","","","M","","M","","M","","","","M","","M" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-11","2022","04","11","","9,5","","-6,8","","1,4","","16,6","","0,0","","","M","","M","","M","","","14","","47","" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-12","2022","04","12","","10,8","","-2,5","","4,2","","13,8","","0,0","","","M","","M","","M","","","24","","60","" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-13","2022","04","13","","4,6","","-3,9","","0,4","","17,6","","0,0","","","M","","M","","M","","","","M","","M" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-14","2022","04","14","","8,4","","-1,3","","3,6","","14,4","","0,0","","","M","","M","","M","","","23","","64","" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-15","2022","04","15","","3,2","","-4,3","","-0,6","","18,6","","0,0","","","M","","M","","M","","","24","","53","" -78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-16","2022","04","16","","1,9","","-4,1","","-1,1","","19,1","","0,0","","","M","","M","","M","","","28","","33",""

If someone could help me with that, it would be very much appreciated !

Answer 1

It actually depends on what the mistakes in the csv file are. If for example you wanted to change the decimal separator from "," to "." you could use the command line tool sed with a regular expression

cat data.csv | sed '2,$s/"\(-\?[0-9]\+\),\([0-9]\+\)"/\1.\2/g' | sed '2,$s/^\(-\?[0-9]\+\),\([0-9]\+\)/\1.\2/'

Answer 2

This is inelegant, but it works for all the lines that start with a numeric:

while read ln; do echo $ln |sed '/^-/s/^/"/' | sed 's/,/",/2' >> new.csv; done < test.csv

For the header line, you'd have to manually add the second double-quote, or use a separate sed iteration.