beagleboard -xm ip static

I installed the TI SDK with matrix-gui and it work right.
Now I need to set IP static: I read the help in this group but in my
file interfaces there is this difference:

# Wired or wireless
interfaces
auto
eth0
iface eth0 inet
dhcp
        pre-up /bin/grep -v -e "ip=[0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\
+" /proc/cmd

ok to set a iface eth0 inet static but I don't know how to manage the
string pre-up /bin/grep -v -e "ip=[0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+" /
proc/cmd:
with or without this line it doesn't work.
Best regards