[xmonad] Issue 493 in xmonad: spawnPipe opens another instance of the applicatioon

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Comment #4 on issue 493 by MathStuf at gmail.com: spawnPipe opens another  
instance of the applicatioon
http://code.google.com/p/xmonad/issues/detail?id=493

I would recommend using xmonadpropwrite instead of spawnPipe in this case.  
An example of xmobarrc[1] xmonad.hs[2] are in my dotfiles repo. Not all  
distros package xmonadpropwrite (it's a script in the xmobar repo, but not  
built by default). I install it for Fedora, but you may have to ask your  
distro to ship it as well.

[1]http://git.benboeckel.net/dotfiles.git/tree/dotfiles/base/X11/xmobar/xmobarrc
[2]http://git.benboeckel.net/dotfiles.git/tree/dotfiles/base/X11/xmonad/xmonad/xmonad.hs