How to edit a line by its index when reading a file line by line?

Question

Lua

Question in titler. That is, I need, let's say, edit the 22nd line of the file (Add a word to the end of the line)

Answer 1

1) Read all lines of the file into an array (table).
2) Change element (line) No. 22 in the array.
3) Overwrite the file by writing all lines from the array again.