I know I can use `-A`, `-B` and `-C` to show surrounding lines but all of them also show the matching line. What I'm trying to make here is so, in this example file:

    foo
    bar

I'd be doing something like `grep <option> "bar" file` and my output should be  
`foo`

*Side note*: I know the way of doing it with another `grep` or using `sed` but I would like to do it just by using one time `grep`