How to edit multiple files at once?

Question

bash

Hey!
There are 50 html files. You need to add a line (link) to them in a certain place.

<a href="indexA.html">linkA</a>(сюда нужно вставить <a href="indexB.html">linkB</a>)<a href="indexС.html">linkС</a>

This code is present in all files. How to do this in bulk via the console or script?

Answer 1

Try for example SED

Answer 2

notepad++?

Answer 3

for f in $(ls addr_with_files); do
 sed -i '/PATTERN/aNEW_LINE' $f;
done

PATTERN is the text of link A (if there are spaces or special characters in it, they need to be escaped with "\" )
NEW_LINE is the text of link B (if there are spaces or special characters in it, they need to be escaped with "\" )
addr_with_files - path to the folder with files
this script will add a new link after all links A in each file
I understand link A is unique in each file?