Edit .csv file, first column not quoted-CodePudding

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:

Longitude (x),"Latitude (y)","Nom de la Station","ID climatologique","Date/Heure","Année","Mois","Jour","Qualité des Données","Temp max.(°C)","Temp max. Indicateur","Temp min.(°C)","Temp min. Indicateur","Temp moy.(°C)","Temp moy. Indicateur","DJC (°C)","DJC Indicateur","DJR (°C)","DJR Indicateur","Pluie tot. (mm)","Pluie tot. Indicateur","Neige tot. (cm)","Neige tot. Indicateur","Précip. tot. (mm)","Précip. tot. Indicateur","Neige au sol (cm)","Neige au sol Indicateur","Dir. raf. max. (10s deg)","Dir. raf. max. Indicateur","Vit. raf. max. (km/h)","Vit. raf. max. Indicateur"
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-78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-03","2022","04","03","","4,3","","-6,0","","-0,9","","18,9","","0,0","","","M","","M","","M","","","","M","","M"
-78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-04","2022","04","04","","7,3","","-8,0","","-0,4","","18,4","","0,0","","","M","","M","","M","","","","M","","M"
-78,84,"48,21","ROUYN-NORANDA A","7086719","2022-04-05","2022","04","05","","9,7","","-5,0","","2,4","","15,6","","0,0","","","M","","M","","M","","","","M","","M"
-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 !

CodePudding user response：

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/'

CodePudding user response：

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.