I have an input:

```
This is a test

```

And I want to insert some letters in the middle of the word, like:

```
This is a teSOMETHINGst

```

I know I can define the needed word by `$i`, but how can I modify the word that way?

I'm trying to do it like that:

```
{
    i=4 # finding somehow
    print (substr($i,1,(length($i)/2)) "SOMETHING" substr($i,(length($i)/2),(length($i)/2)))
}

```

As I'm new to `awk` I wonder if it is a right way.