Assume a multi-line text file (`file`) and the keyword `bar`.

```
> cat file
foo bar baz
foo bar quux
foo quux bar

```

Each line that ends with the keyword shall be prepended with the string `Hello`; each line that does not shall be printed as is.

```
> cat file | sought_command
foo bar baz
foo bar quux
Hello foo quux bar

```

I believe that this can be done via `awk` (something along the lines of `awk '$ ~ /bar/ {print "Hello", $0}'`), but I cannot come up with the correct code and would appreciate suggestions.