There are 50 csv files. each csv file have the same column's name. some content in the column are the same, some don't.

eg：
Code:
test1.csv,  example1.csv, hello.csv,  world.csv.......test70.csv.
now, i want to make a change to two column's content.

a, all csv files have a column named qty. whose rows content are all 0. now, i want to change it into 888

b, all csv files have a column named img. whose rows content are all

Code:
 upload/img1.jpg
 upload/img2.jpg
 upload/img3.jpg
 upload/img01.jpg
 upload/img14.jpg
 upload/img01.jpg
.......
If i open each csv file then do a search and replace. i fell it too bored.

Thank you in advance.