using grep with both -l and -n

I've actually got two questions about grep.

First, can the -l, which just prints the matching filenames, and -n, 
which includes the matched line number using the syntax 
"filename:lineno", be combined to affect.

What I find is that adding -n makes inclusion of -l a noop.

The reason I ask is I'm using grep to generate .gdbinit files.  the 
syntax that -n emits is right on, except for the extra stuff that is 
normally suppressed by -l.

The second question is there a way to defeat the default behavior of not 
including the filename when -n is used and only one file is included in 
the search?  In this case, it prints just the lineno.


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