How to add quotes to second element of a string after comma in a text file bash

File contents:

1234,/Product/number 234567
2456,/Product/number 456789

and so on...many lines

Want the the output as follows:

1234,"/Product/number 234567"
2456,"/Product/number 456789"

For structured data (i.e. that is describable in terms of records consisting of delimited fields) I'd suggest a tool like awk:

awk -F, 'BEGIN{OFS=FS} {$2 = "\"" $2 "\""} {print}' file

or (more compactly - making use of the default print action)

awk -F, 'BEGIN{OFS=FS} {$2 = "\"" $2 "\""} 1' file

If you really need to do it natively in bash, then

while IFS=, read -r a b; do printf '%s,"%s"\n' "$a" "$b"; done < file

(but don't - see Why is using a shell loop to process text considered bad practice?).

You can do this using perl regex and you can substitute similar to using sed.

Assuming you will always have /Product/number followed by a single group of digits, you can use the following command to print the changes:

perl -pe 's|/Product/number (\d+)|"$&"|g' filename

If you are satisfied with the output, you can use the following command to edit the file:

perl -pi -e 's|/Product/number (\d+)|"$&"|g' filename

• (\d+) matches any group of one or more digits
• $& backreferences the entire matched string, similar to using & in sed

Also, I use | as a separator instead of / because the string contains forward-slashes.

Alternatively, you can use sed by using the following command to print:

sed -Ee 's|/Product/number [[:digit:]]+|"&"|g' filenameme

or the following command to actually edit changes to the file:

sed -Ei 's|/Product/number [[:digit:]]+|"&"|g' filenameme

This command uses the extended regular expressions option -E

• [[:digit:]]+ matches a group of one or more digits
• & backreferences the entire matched string

If your data really are as simple as you show, all you want is to add a double quote character after the first comma and after the last character of every line. If so, just do:

$ sed 's/,/,"/; s/$/"/' file
1234,"/Product/number 234567"
2456,"/Product/number 456789"