String manipulation with a script?
I'm a newbie in linux and I have a question about linux script and string manipulation.
In my case I have file with a dump of a mysql database.
ex: INSERT INTO test_table VALUES ('first','1','','','test');
I would like to change this line to add a new parameter.
For example, if I need to add the parameter 'A' in fourth position I will have to count the number of comma (3) and insert the letter 'A'.
My question is. Is it possible to do this with a simple script. If yes, what can I use as command to count a special charater and insert a small string after x special charaters?
Thanks in advance.