[dev] dmenu and dwm: is exec really needed

[Greg Reagle]

I use dwm.  Sometimes I use Mod-p to start a GUI program like firefox. 
I looked at the output of ps xf and noticed that my shell is sticking 
around:
21347 ?        S      0:00 /usr/bin/fish
21388 ?        Rl     0:04  \_ iceweasel
I can type `exec firefox` instead of `firefox` to avoid this, but should 
I have to?  Am I doing something wrong or is dwm supposed to work this way?

Thank you.