Using below command you can replace string inside file. Use the same code and implement desired script for multiple files.
sed -i 's/original/new/g' file.txt
Explanation:
sed = Stream EDitor
-i = in-place (i.e. save back to the original file)
s = the substitute command
original = a regular expression describing the word to replace (or just the word itself)
new = the text to replace it with
g = global (i.e. replace all and not just the first occurrence)
file.txt = the file name