how to remove the double quotes in a csv

Question

I have a CSV file like

a.csv
"1,2,3,4,9"
"1,2,3,6,24"
"1,2,6,8,28"
"1,2,4,6,30"

I want something like

b.csv
1,2,3,4,9
1,2,3,6,24
1,2,6,8,28
1,2,4,6,30

I tried awk '{split($0,a,"\""); But did not help.Any help is appreciated.

Solution 1

Use gsub() function for global substitution

$ awk '{gsub(/"/,"")};1' input.csv                    
1,2,3,4,9
1,2,3,6,24
1,2,6,8,28
1,2,4,6,30

To send output to new file use > shell operator:

awk '{gsub(/"/,"")};1' input.csv > output.csv

Your splitting to array approach also can be used, although it's not necessary, but you can use it as so:

$ awk '{split($0,a,/"/); print a[2]}' input.csv       
1,2,3,4,9
1,2,3,6,24
1,2,6,8,28
1,2,4,6,30

Note that in this particular question the general pattern is that quotes are in the beginning and end of the line, which means we can also treat that as field separator, where field 1 is null, field 2 is 1,2,3,4, and field 3 is also null. Thus, we can do:

awk -F '"' '{print $2}' input.csv

And we can also take out substring of the whole line:

awk '{print substr($0,2,length()-2)}' quoted.csv

Speaking of stripping first and last characters, there's a whole post on stackoverflow about that with other tools such as sed and POSIX shell.

Solution 2

Simplest approach:

tr -d '"' <a.csv >b.csv

Solution 3

Another solution with sed:

sed -e 's/"//g' a.csv > b.csv

Solution 4

You could use this command

awk '{gsub("\"",RS);print}' a.csv >  b.csv

View more solutions

Comments

[Sergiy Kolodyazhnyy]

You mean you want to delete the double quote ? This " ?

[joker21]

Yes exactly I want to remove the " "

[joker21]

In British English, quotation marks are called inverted commas.But anyway no worries

[Kusalananda]

This is the right tool for the job.

[G-Man Says 'Reinstate Monica']

No, that doesn't work.