I Don't need a tool I need an implemetation/alghorithm :)
I need to make a shellscript because I can't install anything on the server
<!-- language-all: lang-none -->

**f2.txt**

    She has 123 apples
    George 18 years is old
    Florin it's leaving
    Michael it's not here
    Peter is smiling

**f1.txt**

    She has 132 apples
    George is 18 years old
    Michael it's not here
    Peter is smiling
    He is sleeping

**Desired output:**

    diff is at:
    line 1 : 123 instead of 132
    line 2 : 18 years is instead of is 18 years
    lines missing:
    He is sleeping
    lines added:
    line 3: Florin it's leaving